Buick Encore: Fixed and Moveable Windows - Diagnostic information and procedures

Buick Encore 2012-2019 Service Manual / Accessories & Equipment / Fixed and Moveable Windows / Fixed and Moveable Windows - Diagnostic information and procedures

DTC B0283: Rear defrost circuit

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DTC B0283: REAR DEFROST CIRCUIT

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0283

Rear Defrost Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The HVAC control module monitors the voltage level on the supply voltage circuit of the rear defog relay. The voltage level should be low while the rear defog relay is de-energized. The voltage will be near system voltage when the HVAC control module energizes the rear defog relay.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

B0283 02

When the HVAC control module detects a short to ground in the relay control circuit for 1 second or greater

B0283 05

When the HVAC control module detects a short to battery or an open/high resistance in the relay control circuit or the relay ground circuit for 1 second or greater.

Action Taken When the DTC Sets

If B0283 02 is current, the rear window defogger grid will be inoperative.
If B0283 05 is current, the rear window defogger grid will operate continuously.

Conditions for Clearing the DTC

The DTC will be current for as long as the fault is present.
When the fault is no longer present, the DTC will be a history DTC.
A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Defogger Schematics (Encore), Defogger Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Rear Window Defogger Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine Running.
Verify the E18 Rear Defogger Grid turns ON and OFF pressing the rear window defogger switch.

If the E18 Rear Defogger Grid does not turn ON or OFF

Refer to Circuit/System Testing

If the E18 Rear Defogger Grid turns ON and OFF

All OK.

Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the X50A Fuse Block- Underhood. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal C5 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Connect the X2 harness connector at the X50A Fuse Block-Underhood. Disconnect the X2 harness connector at the K33 HVAC Control Module, ignition ON.
Verify the E18 Rear Defogger Grid is not activated.

If the E18 Rear Defogger Grid is activated

Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
Test for less than 1 V between the K33 HVAC Control Module control circuit terminal 19 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the X50A Fuse Block-Underhood.
If the E18 Rear Defogger Grid is not activated

Connect a 3 A fused jumper wire between the control circuit terminal 19 and B+.
Verify the E18 Rear Defogger Grid activates.

If the E18 Rear Defogger Grid does not activate

Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
Test for infinite resistance between the K33 HVAC Control Module control circuit terminal 19 and ground.

If less than Infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the X50A Fuse Block-Underhood.
If the E18 Rear Defogger Grid activates

Replace the K33 HVAC Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Compartment Fuse Block Replacement
Control Module References for HVAC control module replacement, programming and setup

DTC B316B, B317A, B318A, OR B319A (AXG, AED, AEQ): Window switch

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B316B

Driver Window Switch

DTC B317A

Passenger Window Switch

DTC B318A

Left Rear Window Switch

DTC B319A

Right Rear Window Switch

For symptom byte information refer to: Symptom Byte List

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver window motor supplies 12V signal circuits to the driver window switch, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0V. The driver window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.

The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the body control module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the appropriate passenger or rear window switch which will perform the command as requested.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B316B 00

The BCM has detected a control switch on the driver window master switch has been active for greater than 60 seconds.

B316B 02

The driver window motor has detected the driver window master switch is active for greater than 60 seconds.

B316B 39

The driver window motor has detected an internal failure within the driver window switch

B317A 02

The BCM has detected the passenger window switch is active for greater than 60 seconds.

B317A 39

The BCM has detected an internal failure within the passenger window switch

B318A 02

The BCM has detected the left rear window switch is active for greater than 60 seconds

B318A 39

The BCM has detected an internal failure within the left rear window switch

B319A 02

The BCM has detected the right rear window switch is active for greater than 60 seconds

B319A 39

The BCM has detected an internal failure within the right rear window switch

Action Taken When the DTC Sets

The affected power window will malfunction

Conditions for Clearing the DTC

B316B 00, B316B 02, B317A 02, B318A 02, B319A 02

The DTC will be current for as long as the fault is present.
The DTC will change from current to history when the fault is no longer present.
A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

B316B 39, B317A 39, B318A 39, B319A 39

If the DTC is current, the affected window switch must be replaced before the DTC can be cleared.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;

Left Rear Main Control Down Switch - Inactive and Active
Left Rear Main Control Express Switch - Inactive and Active
Left Rear Main Control Up Switch - Inactive and Active
Right Rear Main Control Down Switch - Inactive and Active
Right Rear Main Control Express Switch - Inactive and Active
Right Rear Main Control Up Switch - Inactive and Active
Front Passenger Main Control Down Switch - Inactive and Active
Front Passenger Main Control Express Switch - Inactive and Active
Front Passenger Main Control Up Switch - Inactive and Active
If any parameter does not change

Replace the S79D Window Switch-Driver.

If the parameters change

Verify the scan tool parameters listed below change when pressing and pulling the driver window control switch on the driver window master control:

Driver Window Main Control Down Switch - Inactive and Active
Driver Window Main Control Up Switch - Inactive and Active
Driver Window Main Control Express Switch - Inactive and Active
If any parameter does not change

Refer to Circuit/System Testing.

If all the parameters change

Verify the scan tool parameters listed below change when pressing and pulling the S79P Window Switch- Passenger, the S79LR Window Switch-Left Rear and the S79RR Window Switch-Right Rear.

Passenger Window Switch at Door - Inactive, Up, Down, Express Down
Left Rear Window Switch at Door - Inactive, Up, Down, Express Down
Right Rear Window Switch at Door - Inactive, Up, Down, Express Down
If any parameter does not change

Test or replace the appropriate passenger or rear S79 Window Switch

If all the parameters change

All OK.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver, ignition ON
Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.

If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 6 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 2 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Side Door Window Switch Replacement
Front Side Door Window Regulator Motor Replacement
Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)

DTC B316B, B317A, B318A, OR B319A (AXG, AEF, AER): Window switch

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B316B

Driver Window Switch

DTC B317A

Passenger Window Switch

DTC B318A

Left Rear Window Switch

DTC B319A

Right Rear Window Switch

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The window motors supply 12 V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. The window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.

The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the body control module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window motor which will perform the command as requested.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B316B 00

The BCM has detected a control switch on the driver window master switch has been active for greater than 60 seconds.

B316B 02

The driver window motor has detected the driver window master switch is active for greater than 60 seconds.

B317A 02

The passenger window motor has detected the passenger Window Switch is active for greater than 60 seconds.

B318A 02

The left rear window motor has detected the left rear Window Switch is active for greater than 60 seconds

B319A 02

The right rear window motor has detected the right rear Window Switch is active for greater than 60 seconds

B316B 39, B317A 39, B318A 39, B319A 39

The window motor has detected an internal failure within the affected door switch

Action Taken When the DTC Sets

The affected power window will malfunction.

Conditions for Clearing the DTC

B316B 00, B316B 02, B317A 02, B318A 02, B319A 02

The DTC will be current for as long as the fault is present.
The DTC will change from current to history when the fault is no longer present.
A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

B316B 39, B317A 39, B318A 39, B319A 39

If the DTC is current, the affected Window Switch must be replaced before the DTC can be cleared.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;

Left Rear Main Control Down Switch - Inactive and Active
Left Rear Main Control Express Switch - Inactive and Active
Left Rear Main Control Up Switch - Inactive and Active
Right Rear Main Control Down Switch - Inactive and Active
Right Rear Main Control Express Switch - Inactive and Active
Right Rear Main Control Up Switch - Inactive and Active
Front Passenger Main Control Down Switch - Inactive and Active
Front Passenger Main Control Express Switch - Inactive and Active
Front Passenger Main Control Up Switch - Inactive and Active

If any parameter does not change

Replace the S79D Window Switch-Driver.

If the parameters change

Verify the scan tool parameters listed below change when pressing and pulling the driver window control switch on the driver window master control:

Driver Window Main Control Down Switch - Inactive and Active
Driver Window Main Control Up Switch - Inactive and Active
Driver Window Main Control Express Down Switch - Inactive and Active
Driver Window Main Control Express Up Switch - Inactive and Active
If any parameter does not change

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If all the parameters change

Verify the scan tool parameters listed below change when pressing and pulling the S79P Window Switch- Passenger, the S79LR Window Switch-Left Rear and the S79RR Window Switch-Right Rear.

Passenger Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
Left Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
Right Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down
If any parameter does not change

Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.

If all the parameters change

All OK.

Circuit/System Testing

Driver Window Switch Malfunction

Ignition OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver, ignition ON
Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.

If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Passenger/Rear Window Switch Malfunction

Ignition OFF, disconnect the X1 harness connector at the appropriate passenger or rear S79 Window Switch, ignition ON
Verify the appropriate scan tool Window Switch at Door parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74 Window Motor.
Test for infinite resistance between the signal circuit listed below and ground:

S79 Window Switch - signal circuit terminal 6
S79 Window Switch - signal circuit terminal 8
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74 Window Motor.
If Inactive

Install a 3 A fused jumper wire between the circuit terminal listed below and ground:

S79P Window Switch-Passenger - signal circuit terminal 6
S79LR Window Switch-Left Rear - signal circuit terminal 8
S79RR Window Switch-Right Rear - signal circuit terminal 8

Verify the scan tool Window Switch at Door parameter is Up

If not Up

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
Test for less than 1 V between the S79 Window Switch signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74 Window Motor.
If Up

Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground:

S79P Window Switch-Passenger - signal circuit terminal 8
S79LR Window Switch-Left Rear - signal circuit terminal 6
S79RR Window Switch-Right Rear - signal circuit terminal 6

Verify the scan tool Window Switch at Door parameter is Down

If not Down

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
Test for less than 1 V between the S79 Window Switch signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74 Window Motor.
If Down

Test for greater than 10 V between the signal circuit terminal 7 and ground.

If less than 10 V

Ignition OFF, disconnect the harness connector at the M74 Window Motor.
Test for infinite resistance between the S79 Window Switch signal terminal 7 circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance on the circuit.
If less than 2 ohms, replace the M74 Window Motor

If greater than 10 V

Test or replace the passenger or rear S79 Window Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair

Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)
Rear Side Door Window Switch Replacement
Rear Side Door Window Regulator Motor Replacement
Front Side Door Window Regulator Motor Replacement

DTC B316B, B317A, B318A, OR B319A (AXG, A33, A66): Driver window switch

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptor

DTC B316B 00

Driver Window Switch Malfunction

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver window motor is supplied with B+ voltage which is used to power the motor and also used as a reference voltage within the logic circuit. When the driver window switch is pressed, a switch is closed causing the reference voltage in the appropriate circuit in the window motor to drop, the window motor responds by moving the window in the direction commanded.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The driver window motor has detected the driver left front window switch is active for greater than 60 seconds.

Action Taken When the DTC Sets

The driver power window will malfunction

Conditions for Clearing the DTC

The DTC will be current for as long as the fault is present.
The DTC will change from current to history when the fault is no longer present.
A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the scan tool parameters listed below change when pressing and pulling the driver window control switch on the driver window master control:

Driver Window Main Control Down Switch - Inactive and Active
Driver Window Main Control Up Switch - Inactive and Active
Driver Window Main Control Express Switch - Inactive and Active
If any parameter does not change

Refer to Circuit/System Testing

If all the parameters change

All OK.

Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 11 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 8 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 8 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 8 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 9 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 9 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 10 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 10 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 10 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Component Testing

Driver Window Switch

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between the terminals listed below with the switch in the open position:

Ground terminal 11 and control terminal 7
Ground terminal 11 and control terminal 8
Ground terminal 11 and control terminal 9
Ground terminal 11 and control terminal 10
If less than infinite resistance

Replace the S79D Window Switch-Driver.

If infinite resistance

Test for less than 3 ohms between the ground terminal 11 and the control terminal 9 with the switch in the Up position.

If 3 ohms or greater

Replace the S79D Window Switch-Driver.

If less than 3 ohms

Test for less than 3 ohms between the ground terminal 11 and the control terminal 8 with the switch in the Down position.

If 3 ohms or greater

Replace the S79D Window Switch-Driver.

If less than 3 ohms

All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Regulator Motor Replacement
Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)

DTC B3205, B3210, B3215, OR B3220: Window motor

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B3205

Driver Window Motor

DTC B3210

Passenger Window Motor

DTC B3215

Left Rear Window Motor

DTC B3220

Right Rear Window Motor

For symptom byte information, refer to Symptom Byte List .

Circuit/System Description

The body control module (BCM) monitors, receives and transmits serial data to each of the doors switches and window motors. When a window switch has been activated on the driver window switch, a signal is sent to the BCM which sends a signal to the appropriate window motor and the window motor will move in the direction commanded.

Conditions for Running the DTC

The ignition switch is in the ON position.
Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B3205 00, B3210 00, B3215 00, B3220 00

The BCM has detected that the compatibility code stored in the affected window motor does not match the compatibility code stored in the BCM.

B3205 39, B3210 39, B3215 39, B3220 39

An internal malfunction has been detected by the BCM in the power window motor while commanding the window UP or DOWN.

B3205 42, B3210 42, B3215 42, B3220 42

The BCM will automatically attempt to download the calibration program into the appropriate window motor (As will occur when the window motor has been replaced), if the first calibration program fails to load, the BCM will attempt to download the calibration program a second time. If this download fails, the BCM will set appropriate DTC.

B3205 4B, B3210 4B, B3215 4B, B3220 4B

The BCM detects that a window motor is "not normalized" which will occur under the following conditions:

When the battery has been disconnected
When the battery has been replaced
When the door wiring harness has been disconnected
When the window motor has been disconnected

Action Taken When the DTC Sets

B3205 00, B3205 39, B3205 42, B3210 00, B3210 39, B3210 42, B3215 39, B3220 39

The affected motor will be inoperative.

B3205 4B, B3210 4B, B3215 4B, B3220 4B

The affected motor will not perform the express up or express down functions and the driver information center will display Open, then Close Driver Window or will display Open, then Close Passenger Window.

Conditions for Clearing the DTC

B3205 00, B3210 00, B3215 00, B3220 00

Installing a compatible window motor for that specific make and model vehicle.

B3205 39, B3210 39, B3215 39, B3220 39

The appropriate window motor must be replaced before the DTC can be cleared.

B3205 42, B3210 42, B3215 42, B3220 42

The appropriate window motor must be replaced before the DTC can be cleared.

B3205 4B, B3210 4B, B3215 4B, B3220 4B

The appropriate window motor must be normalized before the DTC can be cleared.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the driver, passenger, left rear and right rear window functions while commanding the Driver Window Motor, Passenger Window Motor, Left Rear Window Motor and Right Rear Window Motor Up and Down with a scan tool.

If the Up and Down does not work

Replace the appropriate M74 Window Motor.

If the Up and Down works

Verify the driver, passenger, left rear and right rear window performs the Express Up and Express Down functions with the driver window switch.

If a window does not Express Up and Express Down

Normalize the window motor, refer to Window Motor Programming - Express Function.

If the window performs the Express Up and Express Down functions

All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Regulator Motor Replacement

SYMPTOMS - FIXED AND MOVEABLE WINDOWS

Important Preliminary Checks Before Starting:

Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

There are no DTCs set.
The control modules can communicate via the serial data link.

Review the power window system operation or rear window defogger system operation in order to familiarize yourself with the system functions. Refer to the following:

Rear Window Defogger Description and Operation
Power Windows Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the rear window defogger. Refer to Checking Aftermarket Accessories .
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

NOTE: Inspect for proper installation of electrical components if an intermittent condition exists. Inspect for aftermarket theft deterrent devices, lights, and cellular phones. Ensure that no aftermarket equipment is connected to the class 2 circuit. If you can not locate an intermittent condition, a cellular phone signal may cause the condition. Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

The problem may or may not turn ON the SERVICE VEHICLE SOON indicator or store a DTC. Do not use the symptom tables to diagnose intermittent conditions. The malfunction must be present in order to locate the problem.

Poor electrical connections or wiring cause most intermittent conditions. Perform a careful visual/physical check for the following conditions:

Poor mating of the connector halves or a terminal not fully seated in the connector body
An improperly formed or damaged terminal
Reform or replace connector terminals in the problem circuit in order to ensure proper contact tension.
Poor terminal to wire connection requires removing the terminal from the connector body in order to perform the check.

Use a scan tool in order to help detect intermittent conditions. The scan tool has several features that can be used to locate an intermittent condition. The snapshot feature can capture and store data parameters within the scan tool when the malfunction occurs. This information can then be reviewed in order to see what caused the malfunction.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

Rear Window Defogger Malfunction
Power Windows Malfunction (AXG, AEF, AER), Power Windows Malfunction (AXG, AED, AEQ), Power Windows Malfunction (A55, A66 Without A33), Power Windows Malfunction (A55, A66 With A33), Power Windows Malfunction (AXG, A66, A33)

Rear window defogger malfunction

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

Battery positive voltage is supplied through a 30A fuse in the underhood fuse block, to the rear defogger relay switched input. When the rear window defogger switch is pressed, The HVAC control module commands the rear window defogger system by supplying voltage to the rear defogger relay coil. The rear defogger relay is energized and the defogger indicator is illuminated. With the relay energized, battery positive voltage is allowed from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid.

Reference Information

Schematic Reference

Defogger Schematics (Encore), Defogger Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Rear Window Defogger Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running.
Verify the E18 Rear Defogger Grid turns ON and OFF pressing the rear window defogger switch.

If the E18 Rear Defogger Grid does not turn ON and OFF

Refer to Circuit/System Testing

If the E18 Rear Defogger Grid turns ON and OFF

Verify the rear window defogger indicator turns ON and OFF when commanding the Illuminate All Indicators On and Off with a scan tool.

If the rear window defogger indicator does not turn ON and OFF

Replace the K33 HVAC Control Module.

If the rear window defogger indicator turns ON and OFF

All OK.

Circuit/System Testing

Ignition OFF, and all vehicle systems OFF. Disconnect the X1 and X2 harness connectors at the E18 Rear Defogger Grid. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 X2 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 X1 and ground, Engine Running.
Verify the test lamp does not turn ON and OFF pressing the rear window defogger switch.

If the test lamp turns ON and OFF

Test or replace the E18 Rear Defogger Grid.

If the test lamp does not turn ON and OFF

Ignition OFF, connect the X1 and X2 harness connectors at the E18 Rear Defogger Grid. Disconnect the X2 harness connector at the X50A Fuse Block-Underhood. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal C5 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON
Verify the E18 Rear Defogger Grid is not activated.

If the E18 Rear Defogger Grid is activated

Ignition OFF, disconnect the X1 harness connector at the E18 Rear Defogger Grid, ignition ON.
Test for less than 1 V between the X50A Fuse Block-Underhood control circuit terminal A3 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, test or replace the E18 Rear Defogger Grid.
If the E18 Rear Defogger Grid is not activated

Connect a 30A fused jumper wire between the control circuit terminal A3 and B+.
Verify the E18 Rear Defogger Grid activates.

If the E18 Rear Defogger Grid does not activate

Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the E18 Rear Defogger Grid, ignition ON.
Test for infinite resistance between the control circuit and ground.

If less than Infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, test or replace the E18 Rear Defogger Grid.
If the E18 Rear Defogger Grid activates

Ignition OFF, connect the X2 harness connector at the X50A Fuse Block-Underhood. Disconnect the X2 harness connector at the K33 HVAC Control Module, ignition ON.
Verify the E18 Rear Defogger Grid is not activated.

If the E18 Rear Defogger Grid is activated

Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
Test for less than 1 V between the K33 HVAC Control Module control circuit terminal 19 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the X50A Fuse Block-Underhood.
If the E18 Rear Defogger Grid is not activated

Connect a 3 A fused jumper wire between the control circuit terminal 19 and B+.
Verify the E18 Rear Defogger Grid activates.

If the E18 Rear Defogger Grid does not activate

Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
Test for Test for infinite resistance between the K33 HVAC Control Module control circuit terminal 19 and ground.

If less than Infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the X50A Fuse Block-Underhood.
If the E18 Rear Defogger Grid activates

Replace the K33 HVAC Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Compartment Fuse Block Replacement
Liftgate Window Replacement
Control Module References for HVAC control module replacement, programming and setup

Power windows malfunction (AXG, AEF, AER)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the body control module. The body control module examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the body control module will send a serial data message to the passenger window motor or to the appropriate rear window motor which will perform the command as requested.

Diagnostic Aids

The loss of the express up and express down functions for the driver, passenger and rear windows may have occurred for the following reasons:

The battery was disconnected
The battery was replaced
A door wiring harness was disconnected
A window motor was disconnected

The window motors will need to be normalized in order to restore the express functions, refer to Window Motor Programming - Express Function for the proper procedure.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the driver window functions while commanding the Driver Window Motor Up and Down with a scan tool.

If the window does not move UP and DOWN as commanded

Refer to Circuit/System Testing - Driver Window Motor Malfunction.

If the window moves UP and DOWN as commanded

Verify the driver window moves while commanding the window UP, express UP, DOWN and express DOWN with the S79D Window Switch-Driver.

If the driver window does not move UP or DOWN as commanded

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the driver window does not express UP or express DOWN

Normalize the driver window motor, refer to Window Motor Programming - Express Function.

If after normalization, the driver window does not express UP or express DOWN

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the driver window moves UP, express UP, DOWN and express DOWN as commanded

Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;

Left Rear Main Control Down Switch - Inactive and Active
Left Rear Main Control Express Switch - Inactive and Active
Left Rear Main Control Up Switch - Inactive and Active
Right Rear Main Control Down Switch - Inactive and Active
Right Rear Main Control Express Switch - Inactive and Active
Right Rear Main Control Up Switch - Inactive and Active
Front Passenger Main Control Down Switch - Inactive and Active
Front Passenger Main Control Express Switch - Inactive and Active
Front Passenger Main Control Up Switch - Inactive and Active
If any parameter does not change

Replace the S79D Window Switch-Driver.

If the parameters change

Verify the passenger, left rear and right rear window move while commanding the Passenger Window Motor, Left Rear Window Motor, and Right Rear Window Motor Up and Down with a scan tool.

If the window does not move UP and DOWN as commanded

Refer to Circuit/System Testing - Window Motor Malfunction.

If the window moves UP and DOWN as commanded

Verify the passenger and rear window moves while commanding the window UP, express UP, DOWN and express DOWN with the appropriate passenger or rear S79 Window Switch.

If a passenger or rear window does not move UP or DOWN as commanded

Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.

If a passenger or rear window does not express UP or express DOWN

Normalize the appropriate window motor, refer to Window Motor Programming - Express Function.

If after normalization, a passenger or rear window does not express UP or express DOWN

Refer to Circuit/System Testing - Passenger/Rear Window Switch Malfunction.

If the passenger and rear window moves UP, express UP, DOWN and express DOWN as commanded

All OK.

Circuit/System Testing

Window Motor Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate M74 Window Motor. It may take up to 2 minutes for all vehicle systems to power down
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74 Window Motor.
If the test lamp illuminates

Test or replace the M74 Window Motor.

Driver Window Switch Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 2 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 3 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Passenger/Rear Window Switch Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the appropriate passenger or rear S79 Window Switch. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify the appropriate scan tool Window Switch at Door parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74 Window Motor.
Test for infinite resistance between the signal circuit terminal listed below and ground:

S79 Window Switch - signal circuit terminal 6
S79 Window Switch - signal circuit terminal 8
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74 Window Motor.
If Inactive

Install a 3 A fused jumper wire between the circuit terminal listed below and ground:

S79P Window Switch-Passenger - signal circuit terminal 6
S79LR Window Switch-Left Rear - signal circuit terminal 8
S79RR Window Switch-Right Rear - signal circuit terminal 8

Verify the scan tool Window Switch at Door parameter is Up

If not Up

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
Test for less than 1 V between the S79 Window Switch circuit terminal and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74 Window Motor.
If Up

Install a 3 A fused jumper wire between the circuit terminal listed below and ground:

S79P Window Switch-Passenger - signal circuit terminal 8
S79LR Window Switch-Left Rear - signal circuit terminal 6
S79RR Window Switch-Right Rear - signal circuit terminal 6

Verify the scan tool Window Switch at Door parameter is Down

If not Down

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74 Window Motor, ignition ON.
Test for less than 1 V between the S79 Window Switch signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Ignition OFF, test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74 Window Motor.
If Down

Test for greater than 10 V between the signal circuit terminal 7 and ground

If less than 10 V

Ignition OFF, disconnect the harness connector at the M74 Window Motor.
Test for infinite resistance between the S79 Window Switch signal circuit terminal 7 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance on the circuit.
If less than 2 ohms, replace the M74 Window Motor.
If greater than 10 V

Test or replace the passenger or rear S79 Window Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)
Rear Side Door Window Switch Replacement
Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Regulator Motor Replacement

Power windows malfunction (AXG, AED, AEQ)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver window motor supplies 12 V signal circuits to the driver window switch, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. The driver window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.

Diagnostic Aids

If the driver window is not performing the express up and express down functions, this may indicate that it has not been normalized. This may occur during the following conditions:

When the driver window motor has been disconnected
When the driver door harness has been disconnected
When the battery has been disconnected or replaced

To normalize the driver window motor, refer to Window Motor Programming - Express Function.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the driver window functions while commanding the Driver Window Motor Up and Down with a scan tool.

If the window does not move Up and Down as commanded

Refer to Circuit/System Testing - Driver Window Motor Malfunction.

If the window moves Up and Down as commanded

Verify the driver window moves while commanding the window UP, express UP, DOWN and express DOWN with the S79D Window Switch-Driver.

If the driver window does not move UP or DOWN as commanded

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the driver window does not express UP or express DOWN

Normalize the driver window motor, refer to Window Motor Programming - Express Function.

If after normalization, the driver window does not express UP or express DOWN

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the driver window moves UP, express UP, DOWN and express DOWN as commanded

Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;

Left Rear Main Control Down Switch - Inactive and Active
Left Rear Main Control Express Switch - Inactive and Active
Left Rear Main Control Up Switch - Inactive and Active
Right Rear Main Control Down Switch - Inactive and Active Right Rear Main Control Express Switch - Inactive and Active
Right Rear Main Control Up Switch - Inactive and Active
Front Passenger Main Control Down Switch - Inactive and Active
Front Passenger Main Control Express Switch - Inactive and Active
Front Passenger Main Control Up Switch - Inactive and Active
If any parameter does not change

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the parameters changes

Verify the passenger, left rear and right rear window functions while commanding the Passenger Window Motor, Left Rear Window Motor and Right Rear Window Motor Up and Down with a scan tool.

If the window does not move Up and Down as commanded

Refer to Circuit/System Testing - Passenger Power Window Inoperative.

If the window moves Up and Down as commanded

All OK.

Circuit/System Testing

Driver Window Motor Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M74D Window Motor-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If the test lamp illuminates

Test or replace the M74D Window Motor-Driver.

Driver Window Switch Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 6 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the S79D Window Switch-Driver signal circuit 2 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Passenger Power Window Inoperative

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate passenger or rear S79 Window Switch. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal listed below and ground:

S79P Window Switch-Passenger - ground circuit terminal 1
S79LR Window Switch-Left Rear - ground circuit terminal 5
S79RR Window Switch-Right Rear - ground circuit terminal 5
If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal listed below and ground:

S79P Window Switch-Passenger - B+ circuit terminal 4
S79LR Window Switch-Left Rear - B+ circuit terminal 8
S79RR Window Switch-Right Rear - B+ circuit terminal 8
If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79 Window Switch.
If the test lamp illuminates

Ignition OFF, connect the harness connector at the S79 Window Switch and disconnect the harness connector at the M74 Window Motor.
Test for less than 5 ohms between the control circuit terminal 1 and ground.

If 5 ohms or greater

Ignition OFF, disconnect the harness connector at the S79 Window Switch.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79 Window Switch.
If less than 5 ohms

Test for less than 5 ohms between the control circuit terminal 2 and ground.

If 5 ohms or greater

Ignition OFF, disconnect the harness connector at the S79 Window Switch.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79 Window Switch.
If less than 5 ohms

Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 Window Switch.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79 Window Switch.
If the test lamp turns ON during each of the commands

Test or replace the M74 Window Motor.

Component Testing

Passenger/Rear Window Motor

Ignition OFF, disconnect the harness connector at the appropriate passenger or rear M74 Window Motor.
Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 Window Motor should perform the UP and DOWN functions.

If the function does not perform the UP and DOWN functions

Replace the passenger or rear M74 Window Motor.

If the function performs the UP and DOWN functions

All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Rear Side Door Window Switch Replacement
Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Regulator Motor Replacement
Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)

Power windows malfunction (A55, A66 WITHOUT A33)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The power window system will operate any time the ignition is the ACC or RUN position. The power window system will also operate whenever the I/P fuse block is in RAP mode. The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual passenger power window switches will only control the up and down operation of their respective power window.

Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down. Each power window motor is internally circuit breaker protected.

Battery voltage is supplied to the power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 V and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Circuit/System Verification

Ignition ON.
Verify the driver window performs the UP and DOWN functions

If the driver window does not perform the UP or DOWN functions

Refer to Circuit/System Testing - Driver Window Inoperative

If the driver window performs the UP and DOWN functions

Verify the passenger window performs the UP and DOWN functions at both the driver and passenger door switches.

If the passenger window is inoperative from both the driver and passenger window switches

Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches.

If the passenger window is inoperative from the passenger window switch only

Refer to Circuit/System Testing - Passenger Window Switch Inoperative.

If the passenger window is inoperative from the driver window switch only

Test or replace the S79D Window Switch - Driver.

If the passenger window performs the UP and DOWN functions at both switches

All OK.

Circuit/System Testing

Driver Window Inoperative

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the ignition circuit terminal 3 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, refer to Retained Accessory Power Malfunction .
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for infinite resistance between the control circuits listed below and ground:

Control circuit terminal 4
Control circuit terminal 5
Control circuit terminal 6
Control circuit terminal 7

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver. It may take up to 2 minutes for all vehicle systems to power down
Disconnect the harness connector at the M74D Window Motor-Driver.
Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D window switch - driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 2 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Test or replace the M74D Window Motor-Driver.

Passenger Window Inoperative From Both Switches

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch - Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79P Window Switch- Passenger and disconnect the harness connector at the M74P Window Motor-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 2 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79P Window Switch-Passenger.

If the test lamp remains OFF during either of the commands

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79P Window Switch-Passenger.
If the test lamp turns ON during each of the commands

Test or replace the M74P window motor - passenger.

Passenger Window Switch Inoperative

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger, ignition ON
Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.

If the test lamp does not illuminate

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
If the test lamp illuminates

Test or replace the S79P Window Switch-Passenger.

Component Testing

Ignition OFF, disconnect the harness connector at the appropriate M74 window motor.
Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 window motor should perform the UP and DOWN functions.

If the motor does not perform the UP and DOWN functions

Replace the M74 window motor.

If the motor performs the UP and DOWN functions

All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)
Front Side Door Window Regulator Motor Replacement

Power windows malfunction (A55, A66 WITH A33)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual passenger power window switches will only control the up and down operation of their respective power window.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Circuit/System Verification

Ignition ON.
Verify the driver window performs the UP and DOWN functions.

If the driver window does not perform the UP or DOWN functions

Refer to Circuit/System Testing - Driver Window Inoperative

If the driver window performs the UP and DOWN functions

Verify the passenger window performs the UP and DOWN functions at both the driver and passenger door switches.

If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch- Driver and S79P Window Switch-Passenger

Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches.

If the M74P Window Motor-Passenger is inoperative from the S79P Window Switch- Passenger only

Refer to Circuit/System Testing - Passenger Window Switch Inoperative.

If the M74P Window Motor-Passenger is inoperative from the S79D Window Switch-Driver only

Test or replace the S79D Window Switch - Driver.

If the M74P Window Motor-Passenger performs the UP and DOWN functions at both S79D Window Switch-Driver and S79P Window Switch-Passenger

Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and each of the S79 Window Switch-Rear.

If a M74 Window Motor-Rear is inoperative from both the S79D Window Switch-Driver and S79 Window Switch-Rear

Refer to Circuit/System Testing - Rear Window Inoperative From Both Switches

If a M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear only

Refer to Circuit/System Testing - Rear Window Switch Inoperative

If a M74 Window Motor-Rear is inoperative from the S79D Window Switch-Driver only

Test or replace the S79D Window Switch-Driver.

If the M74 Window Motor-Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and the S79 Window Switch-Rear

Lock out the rear window switches by pressing the lockout switch on the S79D Window Switch-Driver.
Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear is inoperative at both of the S79 Window Switch-Rear .

If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear

Refer to Circuit/System Testing - Rear Window Lockout Inoperative

If both M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear

All OK.

Circuit/System Testing

Driver Window Inoperative

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 11 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the ignition circuit terminal 12 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, refer to Retained Accessory Power Malfunction .
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver and disconnect the harness connector at the M74D Window Motor-Driver. It may take up to 2 minutes for all vehicle systems to power down
Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 2 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Test or replace the M74D Window Motor-Driver.

Passenger Window Inoperative From Both Switches

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch- Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.

If less than 10 ohms

Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79P Window Switch- Passenger and disconnect the harness connector at the M74P Window Motor-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 2 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79P Window Switch-Passenger.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Window Switch- Passenger.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79P Window Switch-Passenger.
If the test lamp turns ON during each of the commands

Test or replace the M74P window motor - passenger.

Passenger Window Switch Inoperative

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger, ignition ON
Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.

If the test lamp does not illuminate

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
If the test lamp illuminates

Test or replace the S79P Window Switch-Passenger.

Rear Window Inoperative From Both Switches

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Ignition ON
Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, refer to Retained Accessory Power Malfunction .
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for infinite resistance between the control circuits listed below and ground:

Control circuit terminal 1
Control circuit terminal 2
Control circuit terminal 3
Control circuit terminal 4
Control circuit terminal 5

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver and disconnect the harness connector at the appropriate S79 Window Switch-Rear. It may take up to 2 minutes for all vehicle systems to power down
Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79 Window Switch- Rear and disconnect the harness connector at the M74 Window Motor-Rear. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal listed below and ground:

Control terminal 1
Control terminal 2
If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79 Window Switch-Rear.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79 Window Switch-Rear.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 Window Switch-Rear.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch- Rear.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79 Window Switch-Rear.
If the test lamp turns ON during each of the commands

Test or replace the M74 Window Motor-Rear.

Rear Window Lockout Malfunction

Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear.
Ignition ON, connect a test lamp between the control circuit terminal 5 and ground.
Verify the test lamp turns ON and OFF when commanding the rear window lockout ON and OFF with the S79D Window Switch-Driver.

If the test lamp is always OFF

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If the test lamp is always ON

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver, ignition ON.
Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the S79D Window Switch-Driver.
If the test lamp turns ON and OFF

Test or replace the S79 Window Switch-Rear.

Component Testing

Window Motor

Ignition OFF, disconnect the harness connector at the appropriate M74 Window Motor.
Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 Window Motor should perform the UP and DOWN functions.

If the motor does not perform the UP and DOWN functions

Replace the M74 Window Motor

If the motor performs the UP and DOWN functions

All OK

Driver Window Switch

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between the terminals listed below with the switch in the open position:

Ignition terminal 13 and control terminal 12
Ignition terminal 13 and control terminal 14
Ignition terminal 6 and control terminal 2
Ignition terminal 6 and control terminal 3
Ignition terminal 6 and control terminal 4
Ignition terminal 6 and control terminal 5
If less than infinite resistance

Replace the S79D Window Switch-Driver.

If infinite resistance

Test for less than 3 ohms between the terminals listed below with the switch in the open position:

Ground terminal 11 and control terminal 2
Ground terminal 11 and control terminal 3
Ground terminal 11 and control terminal 4
Ground terminal 11 and control terminal 5
Ground terminal 11 and control terminal 12
Ground terminal 11 and control terminal 14
If 3 ohms or greater

Replace the S79D Window Switch-Driver.

If less than 3 ohms

Test for less than 3 ohms between the terminals listed below with the switch in the Up position.

Ignition terminal 13 and control terminal 14
Ignition terminal 6 and control terminal 3
Ignition terminal 6 and control terminal 5
If 3 ohms or greater

Replace the S79D Window Switch-Driver.

If less than 3 ohms

Test for less than 3 ohms between the terminals listed below with the switch in the Down position:

Ignition terminal 13 and control terminal 12
Ignition terminal 6 and control terminal 2
Ignition terminal 6 and control terminal 4
If 3 ohms or greater

Replace the S79D Window Switch-Driver.

If less than 3 ohms

All OK

Passenger Window Switch

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for infinite resistance between the terminals listed below with the switch in the open position:

Ignition terminal 5 and control terminal 1
Ignition terminal 5 and control terminal 4
If less than infinite resistance

Replace the S79P Window Switch-Passenger

If infinite resistance

Test for less than 3 ohms between the control terminals listed below with the switch in the open position:

Control terminal 3 and control terminal 1
Control terminal 4 and control terminal 6
If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

If less than 3 ohms

Test for less than 3 ohms between the ignition terminal 5 and the control terminal 1 with the switch in the Up position.

If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

If less than 3 ohms

Test for less than 3 ohms between the ignition terminal 5 and the control terminal 4 with the switch in the Down position.

If 3 ohms or greater

Replace the S79P Window Switch-Passenger.

If less than 3 ohms

All OK

Rear Window Switch

Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear.
Test for infinite resistance between the terminals listed below with the switch in the open position:

Control terminal 5 and control terminal 1
Control terminal 5 and control terminal 4
If less than infinite resistance

Replace the S79 Window Switch-Rear..

If infinite resistance

Test for less than 3 ohms between the control terminals listed below with the switch in the open position:

Control terminal 3 and control terminal 1
Control terminal 4 and control terminal 6
If 3 ohms or greater

Replace the S79 Window Switch-Rear..

If less than 3 ohms

Test for less than 3 ohms between the control terminal 5 and the control terminal 1 with the switch in the Up position.

If 3 ohms or greater

Replace the S79 Window Switch-Rear..

If less than 3 ohms

Test for less than 3 ohms between the control terminal 5 and the control terminal 4 with the switch in the Down position.

If 3 ohms or greater

Replace the S79 Window Switch-Rear..

If less than 3 ohms

All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)
Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Regulator Motor Replacement
Rear Side Door Window Switch Replacement

Power windows malfunction (AXG, A66, A33)

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver side window consists of a driver window switch and a window motor capable of express up and express down functions. When the driver window switch is pressed or pulled, the voltage within the appropriate signal circuit drops and the window motor will then perform the commanded function

Diagnostic Aids

A window motor that has not been normalized will no longer perform the express up and express down functions, this may occur during the following conditions:

When a window motor has been disconnected
When a door harness has been disconnected
When the battery has been disconnected or replaced

To normalize the window motor refer to Window Motor Programming - Express Function.

Reference Information

Schematic Reference

Moveable Window Schematics (Encore), Moveable Window Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON.
Verify the M74D Window Motor-Driver functions while commanding the Driver Window Motor Up and Down with a scan tool.

If the M74D Window Motor-Driver does not move UP and DOWN as commanded

Refer to Circuit/System Testing - Driver Window Motor Malfunction.

If the M74D Window Motor-Driver moves UP and DOWN as commanded

Verify the M74D Window Motor-Driver moves while commanding the window UP and DOWN with the S79D Window Switch-Driver.

If the M74D Window Motor-Driver does not move UP and DOWN as commanded

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the M74D Window Motor-Driver moves UP and DOWN as commanded

Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver.

If the driver window does not express UP or express DOWN

Normalize the M74D Window Motor-Driver, refer to Window Motor Programming - Express Function.

Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver

If the M74D Window Motor-Driver does not express UP or express DOWN

Refer to Circuit/System Testing - Driver Window Switch Malfunction.

If the M74D Window Motor-Driver performs the express UP and express DOWN functions

Verify the M74P Window Motor-Passenger performs the UP and DOWN functions at both the S79D Window Switch-Driver and S79P Window Switch-Passenger.

If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch-Driver and S79P Window Switch-Passenger

Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches.

If the M74P Window Motor-Passenger is inoperative from the S79P Window Switch- Passenger only

Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch.

If the M74P Window Motor-Passenger is inoperative from the S79D Window Switch-Driver only

Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch.

If the M74P Window Motor-Passenger performs the UP and DOWN functions at both S79D Window Switch-Driver and S79P Window Switch-Passenger

Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and each of the S79 Window Switch- Rear.

If a M74 Window Motor-Rear is inoperative from both the driver and rear window switch

Refer to Circuit/System Testing - Rear Window Inoperative From Both Switches

If a M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear only

Refer to Circuit/System Testing - Rear Window Switch Inoperative

If a M74 Window Motor-Rear is inoperative from the S79D Window Switch-Driver only

Test or replace the S79D Window Switch-Driver.

If both M74 Window Motor-Rear performs the UP and DOWN functions at the S79D Window Switch-Driver and the S79 Window Switch-Rear

Lock out the rear window switches by pressing the lockout switch on the S79D Window Switch-Driver.
Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear is inoperative at both of the S79 Window Switch-Rear .

If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear

Refer to Circuit/System Testing - Rear Window Lockout Inoperative

If both M74 Window Motor-Rear are inoperative from the S79 Window Switch-Rear

All OK.

Circuit/System Testing

Driver Window Motor Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M74D Window Motor-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the B+ circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the B+ circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If the test lamp illuminates

Replace the M74D Window Motor-Driver.

Driver Window Switch Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the ground circuit terminal 11 and ground.

If 10 ohms or greater

Ignition OFF.
Test for less than 2 ohms in the ground circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, repair the open/high resistance in the ground connection.
If less than 10 ohms

Ignition ON.
Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the signal circuit terminal 8 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 8 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Down Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the signal circuit terminal 8 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the signal circuit terminal 9 and ground

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Up Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the signal circuit terminal 9 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.

If not Inactive

Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
Test for infinite resistance between the signal circuit terminal 7 and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the M74D Window Motor-Driver.
If Inactive

Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 11.
Verify the scan tool Driver Window Main Control Express Switch parameter is Active

If not Active

Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
Test for less than 1 V between the signal circuit terminal 7 and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V

Test for less than 2 ohms in the signal circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the M74D Window Motor-Driver.
If Active

Test or replace the S79D Window Switch-Driver.

Passenger Window Inoperative From Both Switches

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch- Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch- Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79P Window Switch- Passenger and disconnect the harness connector at the M74P Window Motor-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 2 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79P Window Switch-Passenger.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79P Window Switch-Passenger.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Window Switch- Passenger.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79P Window Switch-Passenger.
If the test lamp turns ON during each of the commands

Test or replace the M74P Window Motor-Passenger.

Passenger Window Inoperative From A Single Switch

Ignition OFF, disconnect the harness connector at the appropriate S79P Window Switch-Passenger or S79D Window Switch-Driver, ignition ON
Verify a test lamp illuminates between the ignition circuit terminal listed below and ground.

S79P Window Switch-Passenger - ignition circuit terminal 5
S79D Window Switch-Driver - ignition circuit terminal 13
If the test lamp does not illuminate

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
If the test lamp illuminates

Test or replace the S79P Window Switch-Passenger or S79D Window Switch-Driver,.

Rear Window Inoperative From Both Switches

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Ignition ON
Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.

If the test lamp does not illuminate and the circuit fuse is good

Ignition OFF.
Test for less than 2 ohms in the ignition circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, refer to Retained Accessory Power Malfunction .
If the test lamp does not illuminate and the circuit fuse is open

Ignition OFF.
Test for infinite resistance between the ignition circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for infinite resistance between the control circuit terminals listed below and ground:

Control circuit terminal 1
Control circuit terminal 2
Control circuit terminal 3
Control circuit terminal 4
Control circuit terminal 5

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp illuminates

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch- Driver and disconnect the harness connector at the appropriate S79 Window Switch-Rear. It may take up to 2 minutes for all vehicle systems to power down
Test for less than 10 ohms between the control circuit terminal 3 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Test for less than 10 ohms between the control circuit terminal 6 and ground.

If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.

If the test lamp remains OFF during either of the commands

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79D Window Switch-Driver.
If the test lamp turns ON during each of the commands

Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79 Window Switch- Rear and disconnect the harness connector at the M74 Window Motor-Rear. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 ohms between the control circuit terminal listed below and ground:

Control terminal 1
Control terminal 2
If 10 ohms or greater

Ignition OFF, disconnect the harness connector at the S79 Window Switch-Rear.
Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79 Window Switch-Rear.
If less than 10 ohms

Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 Window Switch-Rear.

If the test lamp remains OFF during either of the commands

Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch- Rear.
Test for infinite resistance between each control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S79 Window Switch-Rear.
If the test lamp turns ON during each of the commands

Test or replace the M74 Window Motor-Rear.

Rear Window Lockout Inoperative

Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear. Ignition ON
Connect a test lamp between the control circuit terminal 5 and ground.
Verify the test lamp turns ON and OFF when commanding the rear window lockout ON and OFF with the rear window lockout switch.

If the test lamp is always OFF

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
Test for infinite resistance between the control circuit and ground.

If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance

Test for less than 2 ohms in the control circuit end to end.

If 2 ohms or greater, repair the open/high resistance in the circuit.
If less than 2 ohms, replace the S79D Window Switch-Driver.
If the test lamp is always ON

Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver, ignition ON.
Test for less than 1 V between the control circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the S79D Window Switch-Driver.
If the test lamp turns ON and OFF

Test or replace the S79 Window Switch-Rear.

Component Testing

Ignition OFF, disconnect the harness connector at the appropriate passenger or rear M74 Window Motor.
Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 Window Motor should perform the UP and DOWN functions.

If the M74 Window Motor does not perform the UP and DOWN functions

Replace the passenger or rear M74 Window Motor.

If the M74 Window Motor performs the UP and DOWN functions

All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Side Door Window Regulator Motor Replacement
Rear Side Door Window Switch Replacement
Rear Side Door Window Regulator Replacement (Power), Rear Side Door Window Regulator Replacement
Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore), Front Side Door Window Switch Replacement (Driver Side, Encore), Front Side Door Window Switch Replacement (Passenger Side, Encore)

SIDE DOOR WINDOW MECHANICAL DIAGNOSIS

Side Door Window Mechanical Diagnosis

Side Door Window Mechanical Diagnosis

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Buick Encore: Fixed and Moveable Windows - Diagnostic information and procedures

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Fixed and Moveable Windows - Description and operation

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Side Blind Zone Alert (SBZA)

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