Buick Encore: Wipers and Washers - Diagnostic information and procedures

DTC B370A: Rain sensor

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DTC B370A: RAIN SENSOR

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 B370A

Rain Sensor

For symptom byte information, refer to Symptom Byte List .

Circuit/System Description

B+ and ground is supplied at all times to the rain sensor. The rain sensor communicates with the body control module (BCM) via serial data. When the ignition is in the ON or ACCESSORY position and the windshield wiper/washer switch is in the intermittent delay position, the BCM monitors the rain sensor to determine the rain build up on the windshield. As rain builds up on the windshield, the BCM will command the wipers to activate. The sensitivity of the wiper frequency is controlled by the intermittent delay of the windshield wiper/washer switch. As the sensitivity is increased, the BCM will command more frequent wiper activation based on rain build up on the windshield.

Conditions for Running the DTC

• Ignition ON.
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

Communication between the BCM and the rain sensor is interrupted.

Action Taken When the DTC Sets

• If the BCM loses communication with the rain sensor while operating with single wipes, the windshield wiper operation will default to intermittent operation with a fixed dwell time of 4 seconds.
• If the BCM loses communication with the rain sensor while operating at low speed, the windshield wiper operation will default to low speed.
• If the BCM loses communication with the rain sensor while operating at high speed, the windshield wiper operation will default to high speed.

Conditions for Clearing the DTC

The DTC will clear when communication is established between the BCM and rain sensor.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify DTC U151A is not set.

If the DTC is set

Please Refer to DTC U1500-U15FF

If the DTC is not set

3. Verify the windshield wipers operate at low speed when the S82 Windshield Wiper/Washer Switch is in the LO position.

• If the windshield wipers are not operating at low speed

Refer to Windshield Wiper System Malfunction.

• If the windshield wipers are operating at low speed

4. Place the S82 Windshield Wiper/Washer Switch in the intermittent delay setting and spray the outside of the windshield in the area of the B117 Rain Sensor with a water bottle. It may be necessary to increase the sensitivity of the intermittent delay to achieve windshield wiper operation.
5. Verify the windshield wipers operate at low speed.

• If the wipers are not operating at low speed

Test or replace the B117 Rain Sensor.

• If the wipers are operating at low speed

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Windshield Outside Moisture Sensor Replacement

DTC B370B: Rear wiper function control 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 Descriptor

DTC B370B

Rear Wiper Function Control Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the rear wiper motor based on an input from the rear wiper switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. The BCM monitors applies and monitors voltage on the rear wiper switch signal circuit. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.

The rear wiper motor is controlled by the BCM through the rear wiper relay. A constant B+ and ground are supplied to the rear wiper motor. When rear wiper operation is requested, the BCM will apply voltage to the rear wiper relay control circuit. This will cause the contacts in the rear wiper relay to close and apply B+ to the rear wiper motor through the rear wiper control circuit, enabling rear wiper operation. When the rear wiper request is no longer present, the contacts in the rear wiper relay will open, removing B+ from the rear wiper motor control circuit. The rear wiper motor will continue to operate using the constant B+ circuit until it is in the park position.

Conditions for Running the DTC

• Ignition ON
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B370B 01

A short to voltage is detected in the rear wiper relay control circuit.

B370B 02

A short to ground is detected in the rear wiper relay control circuit.

B370B 04

An open or high resistance is detected in the rear wiper relay control circuit.

Action Taken When the DTC Sets

Rear wiper operation is disabled.

Conditions for Clearing the DTC

The DTC will clear when the conditions for setting the DTC are no longer present.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the scan tool Rear Closure Ajar Switch parameter changes between Inactive and Active when opening and closing the liftgate.

If the parameter does not change

Refer to Door Ajar Indicator Malfunction

If the parameter changes

3. Verify the Scan Tool Rear Wiper Switch Parameter changes between ON and OFF when cycling the rear wiper switch ON and OFF.

• If the parameter does not change
• Refer to Circuit/System Testing - Rear Wiper/Washer Switch Malfunction

If the parameter changes

4. Verify the M45 Rear Wiper Motor cycles when commanding the rear wiper ON with the rear wiper switch

If the M45 Rear Wiper Motor does not cycle

Refer to Refer to Circuit/System Testing - Rear Wiper Motor Malfunction

If the M45 Rear Wiper Motor cycles

5. Verify the M45 Rear Wiper Motor returns to the park position when the rear wipers are turned OFF

If the M45 Rear Wiper Motor does not return to the park position

Refer to Circuit/System Testing - Rear Wiper Motor Malfunction

If the M45 Rear Wiper Motor returns to the park position

6. All OK.

Circuit/System Testing

Rear Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.

If less than 10 ohms

3. Ignition ON.
4. Test for greater than 8 V between the signal circuit terminal 4 and ground.

If less than 8 V

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit and ground

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

3. 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 K9 Body Control Module.

If 8 V or greater

5. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
6. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 4 and ground.

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

7. Test or replace the S82 Windshield Wiper/Washer Switch.

Rear Wiper Motor Malfunction

1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the M45 Rear Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 3 and ground.

If 10 ohms or greater

1. 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

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

• If the test lamp does not illuminate

1. Ignition OFF, remove the test lamp. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. 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 X50A Fuse Block - Underhood.

If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 1 and ground.
6. Verify the test lamp does NOT turn ON and OFF when commanding the rear wiper ON and OFF with the rear wiper switch.

If the test lamp turns ON and OFF

Test or replace the M45 Rear Wiper Motor.

If the test lamp does not turn ON and OFF

7. Ignition OFF, connect the harness connector at the M45 Rear Wiper Motor. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between each ground circuit terminal listed below and ground:

• Terminal C5
• Terminal H5

If 10 ohms or greater

1. 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

9. Ignition ON.
10. Verify the M45 Rear Wiper Motor is not activated.

If the M45 Rear Wiper Motor is activated

1. Ignition OFF, disconnect the harness connector at the M45 Rear Wiper Motor, ignition ON.
2. Test for less than 1 V between the control circuit terminal 1 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the M45 Rear Wiper Motor.

If the M45 Rear Wiper Motor is not activated

11. Connect a 20 A fused jumper wire between both of the circuits listed below and B+.

• B+ Circuit Terminal H4
• Control Circuit Terminal H3

12. Verify the M45 Rear Wiper Motor activates

If the M45 Rear Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M45 Rear Wiper Motor, ignition ON.
2. 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

3. 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 M45 Rear Wiper Motor.

If the M45 Rear Wiper Motor activates

13. Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
14. Verify the M45 Rear Wiper Motor is not activated.

If the M45 Rear Wiper Motor is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal 10 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 M45 Rear Wiper Motor is not activated

15. Connect a 10 A fused jumper wire between the control circuit terminal 10 and B+.
16. Verify the M45 Rear Wiper Motor activates.

If the M45 Rear Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.

If the M45 Rear Wiper Motor activates

17. Test or replace the K9 Body Control Module.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 4 and the low reference terminal 2 with the rear wiper switch in the OFF position.

If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

If infinite resistance

3. Verify the resistance is within the range specified below between the signal circuit terminal 4 and the low reference circuit terminal 2 by cycling the switch between Rear Wiper position and Rear Washers position.

• Rear Wiper : 624-644 ohms
• Rear Wiper Sweep : 1.8-2.2 kohms
• Rear Washer : 5.9-6.4 kohms

If not within the specific range

Replace the S82 Windshield Wiper/Washer Switch.

If within the specific range

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Rear Window Wiper Motor Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

DTC B3715 OR B3875: Windshield wiper relay

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 B3715

Windshield Wiper Relay Circuit

DTC B3875

Windshield Wiper High Speed Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the windshield wiper motor based on inputs from the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The windshield wiper/washer switch uses a resistor ladder to determine low speed and intermittent operation. The BCM monitors applies and monitors voltage on the windshield wiper switch signal circuit. When the wiper switch is placed in the low speed or intermittent position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding on the low speed or intermittent wipers. The high speed wipers are controls through a discrete signal circuit. With the windshield wiper/washer switch is in the high speed position, the windshield wiper high speed switch signal circuit is pulled directly to ground. The BCM will respond by commanding on the high speed wipers.

The windshield wiper motor is controlled by the BCM through the windshield wiper replay and the windshield wiper speed control relay. A constant and ground is supplied to the rear wiper motor. When low speed windshield wiper operation is requested, the BCM will apply voltage to the windshield wiper relay control circuit. This will cause the contacts in the windshield wiper relay to close and apply B+ to the windshield wiper motor through the windshield wiper low speed control circuit, enabling low speed wiper operation. When high speed windshield wiper operation is requested, the BCM continues to apply voltage to the windshield wiper relay control circuit and also applies ground to the windshield wiper speed control relay control circuit. This will cause the contacts in the windshield wiper speed control relay to close and apply B+ to the windshield wiper motor through the windshield wiper high speed control circuit, enabling high speed wiper operation.

When the windsheild wiper request is no longer present, the contacts in the windshield wiper relay and windshield wiper speed control relay will open, removing B+ from the wiper motor control circuits. The windshield wiper motor will continue to operate using a discrete B+ circuit provided by the BCM until the wipers are in the park position.

Conditions for Running the DTC

• A wiper output is actively being requested by the BCM.
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B3715 01

A short to voltage is detected in the windshield wiper relay control circuit.

B3715 02

A short to ground is detected in the windshield wiper relay control circuit.

B3715 04

An open or high resistance is detected in the windshield wiper relay control circuit.

B3875 01

A short to voltage is detected in the windshield wiper high speed relay control circuit.

B3875 02

A short to ground is detected in the windshield wiper high speed relay control circuit.

B3875 04

An open or high resistance is detected in the windshield wiper high speed relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the wiper output.

Conditions for Clearing the DTC

• A current DTC will clear when the condition for setting the fault is no longer present.
• A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the scan tool Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers.

If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

If the parameter changes

3. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers.

If the parameter does not change

Test or replace the S82 Windsheild Wiper/Washer Switch.

If the parameter changes

4. Verify the scan tool Windshield Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers.

If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

If the parameter changes

5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High.

If the Windshield Wiper Motor does not cycle between Off, Low, and High

Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction

If the Windshield Wiper Motor cycles between Off, Low, and High

6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active.

If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction.

If the parameter changes

8. All OK.

Circuit/System Testing

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.

If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 1 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.

If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Wiper High Speed Switch parameter is Active.

If not Active

1. Ignition OFF, remove the jumper wire, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.

If Active

7. Test for greater than 8 V between the signal circuit terminal 3 and ground.

If less than 8 V

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit and ground

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

3. 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 K9 Body Control Module.

If 8 V or greater

8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground

If 1 V or greater

Repair the short to voltage on the circuit.

If less than 1 V

10. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. 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

3. Ignition ON.
4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the M75 Windshield Wiper Motor signal circuit terminal 2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.

If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
6. Verify the scan tool Windshield Wiper Park Switch parameter is Active.

If not Active

1. Ignition OFF, remove the jumper wire, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.

If Active

7. Connect a test lamp between the following control circuits and ground, ignition ON.

• Control Circuit Terminal 4
• Control Circuit Terminal 5

8. Verify the test lamp does NOT turn ON and OFF when commanding the appropriate Windshield Wiper Relay On and Off with a scan tool.

If the test lamp turns ON and OFF for both terminals

Test or replace the M75 Windshield Wiper Motor.

If the test lamp does not turn ON and OFF for one or both terminals

9. Ignition OFF and all vehicle systems OFF, connect the harness connector at the M75 Windshield Wiper Motor. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
10. Test for less than 10 ohms between the ground circuit terminals listed below and ground:

• Terminal C5
• Terminal H1

If 10 ohms or greater

1. Ignition OFF.
2. 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

11. Ignition ON.
12. Verify the M75 Windshield Wiper Motor is not activated.

If the M75 Windshield Wiper Motor is activated

1. Ignition OFF, disconnect the harness connector at the M75 Windshield Wiper Motor, ignition ON.
2. Test for less than 1 V between each control circuit listed below and ground:

• Terminal 4
• Terminal 5

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

If less than 1 V, replace the M75 Windshield Wiper Motor.

If the M75 Windshield Wiper Motor is not activated

13. Connect a 20 A fused jumper wire between the control circuit terminals listed below, one at a time, and B+.

• Terminal H2
• Terminal C1

14. Verify the M75 Windshield Wiper Motor activates.

If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M75 Windshield Wiper Motor.
2. 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

3. 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 M75 Windshield Wiper Motor.

If the M75 Windshield Wiper Motor activates

15. Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
16. Verify the M75 Windshield Wiper Motor low speed is not activated.

If the M75 Windshield Wiper Motor low speed is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal D3 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 M75 Windshield Wiper Motor low speed is not activated

17. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
18. Verify the M75 Windshield Wiper Motor High Speed is not activated.

If the M75 Windshield Wiper Motor high speed is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for infinite resistance between the control circuit terminal D2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the X50A Fuse Block - Underhood.

If the M75 Windshield Wiper Motor high speed is not activated

19. Connect a 10 A fused jumper wire between the control circuit terminal 16 X4 and B+.
20. Verify the M75 Windshield Wiper Motor activates.

If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.

If the M75 Windshield Wiper Motor activates

21. Connect a 10 A fused jumper wire between the control circuit terminal 24 X5 and ground.
22. Verify the M75 Windshield Wiper Motor activates.

If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for less than 1 V between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.

If the M75 Windshield Wiper Motor activates

23. Replace the K9 Body Control Module.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the switch in the open position.

If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

If infinite resistance

3. Test for less than 2 ohms between the signal circuit terminal 1 and the low reference circuit terminal 2 with the switch in the closed position.

If 2 ohms or greater

Replace the S82 Windshield Wiper/Washer Switch.

If less than 2 ohms

4. Test for infinite resistance between the signal terminal 3 and the low reference terminal 2 with the switch in the open position.

If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

If infinite resistance

5. Verify the resistance readings are within the specified range listed below between the signal circuit terminal 3 and the low reference circuit terminal 2 by pushing the switch in the listed positions below.

• Delay 1 : 3.75-3.85kohms
• Delay 2 : 2.75-2.85kohms
• Delay 3 : 1.95-2.05kohms
• Delay 4 : 1.25-1.35kohms
• Delay 5 : 765-775ohms

If not within the specified range

Replace the S82 Windshield Wiper/Washer Switch.

If within the specified range

6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Windshield Wiper Motor Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

DTC B3811: Rear washer relay

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 B3811

Rear Washer Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the rear washer based on an input from the rear wiper switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. The BCM monitors applies and monitors voltage on the rear wiper switch signal circuit. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.

The windshield washer uses a single windshield washer pump to provide fluid for both the front and rear washers. Changing the polarity of the motor will cause it to spin in opposite directions, feeding fluid to the front or rear. When rear washers are requested, the BCM applies voltage to the rear window washer pump relay control circuit. This causes the contacts in the rear washer pump relay to close and supplies voltage to the windshield washer pump. Ground for the windshield washer pump is provided through the windshield washer pump relay, which is switched to ground in it's at-rest state.

Conditions for Running the DTC

• Ignition ON
• The system voltage is between 9-16 V

Conditions for Setting the DTC

B3811 01

A short to voltage has been detected on the rear window washer pump relay control circuit

B3811 04

A open/high resistance has been detected on the rear window washer pump relay control circuit

Action Taken When the DTC Sets

Rear washer operation is disabled.

Conditions for Clearing the DTC

• A current DTC clears when the diagnostic runs and passes.
• A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Diagnostic Aids

The rear liftgate must be closed in order for the rear wiper to work

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the Scan Tool Rear Closure Ajar Switch Parameter changes between Inactive and Active when Opening and closing the liftgate.

If the parameter does not change

Refer to Door Ajar Indicator Malfunction

If the parameter changes

3. Verify the scan tool Rear Wiper Switch parameter changes between On and Off when cycling the rear wiper switch ON and OFF.

If the parameter does not change

Refer to Rear Wiper System Malfunction

If the parameter changes

4. Verify the G24 Windshield Washer Pump turns on and off when commanding the rear washers OFF and ON with the rear washer switch

If the Rear Window Washers do not turn ON

Refer to Circuit/System Testing

If the Rear Window Washers turn ON

5. All OK.

Circuit/System Testing

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

If 10 ohms or greater

1. 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

3. Connect the X2 harness connector and disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
4. Test for infinite resistance between each of the control circuit terminals listed below and ground.

• Terminal G3
• Terminal H3

If less than Infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

5. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
6. Test for less than 1 V between the control circuit terminals listed below and ground:

• Terminal 1
• Terminal 2

If 1 V or greater

1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
2. 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, test or replace the X50A Fuse Block - Underhood.

If less than 1 V

7. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

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

If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

10. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
11. Verify the test lamp does NOT turn ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.

If the test lamp turns ON and OFF

Test or replace the G24 Windshield Washer Pump.

If the test lamp does not turn ON and OFF

12. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
13. Connect a test lamp between the control circuit terminal G2 and ground.
14. Verify the test lamp turns ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.

If the test lamp is always OFF

1. Ignition OFF, remove the test lamp. Disconnect the X1 harness connector at the K9 Body Control Module.
2. 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.

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

• If 2 ohms or greater, repair the short to ground on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module

If the test lamp is always ON

1. Ignition OFF, remove the test lamp. Disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 2 ohms or greater, repair the short to voltage on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module

If the test lamp turns ON and OFF.

15. Test or replace the X50A Fuse Block - Underhood.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Windshield Washer Pump Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

DTC B3873: Front washer relay

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 B3873

Front Washer Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the windshield washer based on an input from the windshield washer switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield washer switch through a discrete signal circuit. When the washer switch is pressed, the signal circuit is pulled to ground. The BCM will respond by commanding the washer function.

The windshield washer uses a single windshield washer pump to provide fluid for both the front and rear washers. Changing the polarity of the motor will cause it to spin in opposite directions, feeding fluid to the front or rear. When front washers are requested, the BCM applies voltage to the windshield washer pump relay control circuit. This causes the contacts in the windshield washer pump relay to close and supplies voltage to the windshield washer pump. Ground for the windshield washer pump is provided through the rear window washer pump relay, which is switched to ground in it's at-rest state.

Conditions for Running the DTC

• Ignition ON.
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B3873 01

A short to voltage has been detected on the windshield washer pump relay control circuit

B3873 02

A short to ground has been detected on the windshield washer pump relay control circuit

B3873 04

An open/high resistance has been detected on the windshield washer pump relay control circuit

Action Taken When the DTC Sets

Washer operation is suspended.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify Windshield Washer pump does not activate

If Windshield Washer Pump Activates,

Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

If Windshield Washer Pump does not Activate

3. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing and releasing the washer switch.

If the parameter does not change

Refer to Circuit/System Testing - Washer Switch Malfunction.

If the parameter changes

4. Verify the G24 Windshield Washer Pump activates when commanding the Windshield Washer Relay Active with a scan tool.

If the Windshield Washers do not turn ON

Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

If the Windshield Washers turn ON

All OK.

Circuit/System Testing

Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.

If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Windshield Washer Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.

If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Washer Switch parameter is Active.

If not Active

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.

If Active

7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Washer Pump Malfunction

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

If 10 ohms or greater

1. 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

3. Connect the X2 harness connector and disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
4. Test for infinite resistance between each of the control circuit terminals listed below and ground.

• Terminal G3
• Terminal H3

If less than Infinite resistance

Repair the short to ground on the circuit.

If infinite resistance

5. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
6. Test for less than 1 V between the control circuit terminals listed below and ground:

• Terminal 1
• Terminal 2

If 1 V or greater

1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
2. 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, test or replace the X50A Fuse Block - Underhood.

If less than 1 V

7. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

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

If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

10. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
11. Verify the test lamp does NOT turn ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.

If the test lamp turns ON and OFF

Test or replace the G24 Windshield Washer Pump.

If the test lamp does not turn ON and OFF

12. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
13. Connect a test lamp between the control circuit terminal G9 and ground.
14. Verify the test lamp turns ON and OFF when commanding the Windshield Washer Relay Active with a scan tool.

If the test lamp is always OFF

1. Ignition OFF, remove the test lamp. Disconnect the X4 harness connector at the K9 Body Control Module.
2. 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.

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

• If 2 ohms or greater, repair the short to ground on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module

If the test lamp is always ON

1. Ignition OFF, remove the test lamp. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 2 ohms or greater, repair the short to voltage on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module

If the test lamp turns ON and OFF.

15. Test or replace the X50A Fuse Block - Underhood.

Component Testing

Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position.

If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

If infinite resistance

3. Test for less than 2 ohms between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position.

If 2 ohms or greater

Replace the S82 Windshield Wiper/Washer Switch.

If less than 2 ohms

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Compartment Fuse Block Replacement
• Windshield Washer Pump Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

Symptoms - wiper/washer systems

NOTE: The following steps must be completed before using the symptom tables:

1. Perform Diagnostic System Check - Vehicle , in order to verify that all of the following conditions are true:

• No DTCs are set.
• The control modules can communicate via the serial data link.

2. Refer to Wiper/Washer System Description and Operation in order to familiarize yourself with the system functions.

Visual/Physical Inspection

• Inspect for aftermarket devices which may affect the operation of the windshield wiper/washer system.

  Refer to Checking Aftermarket Accessories .

• Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
• Inspect the washer fluid reservoir for the proper fluid level.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections

Symptom List

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

• Windshield Wiper System Malfunction
• Washer Malfunction
• Rear Washer System Malfunction
• Rear Wiper System Malfunction
• Rain Sensor Malfunction

WINDSHIELD WIPER SYSTEM 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.

DTC Descriptors

DTC B3715

Windshield Wiper Relay Circuit

DTC B3875

Windshield Wiper High Speed Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the windshield wiper motor based on inputs from the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The windshield wiper/washer switch uses a resistor ladder to determine low speed and intermittent operation. The BCM monitors applies and monitors voltage on the windshield wiper switch signal circuit. When the wiper switch is placed in the low speed or intermittent position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding on the low speed or intermittent wipers. The high speed wipers are controls through a discrete signal circuit. With the windshield wiper/washer switch is in the high speed position, the windshield wiper high speed switch signal circuit is pulled directly to ground. The BCM will respond by commanding on the high speed wipers.

The windshield wiper motor is controlled by the BCM through the windshield wiper replay and the windshield wiper speed control relay. A constant and ground is supplied to the rear wiper motor. When low speed windshield wiper operation is requested, the BCM will apply voltage to the windshield wiper relay control circuit. This will cause the contacts in the windshield wiper relay to close and apply B+ to the windshield wiper motor through the windshield wiper low speed control circuit, enabling low speed wiper operation. When high speed windshield wiper operation is requested, the BCM continues to apply voltage to the windshield wiper relay control circuit and also applies ground to the windshield wiper speed control relay control circuit. This will cause the contacts in the windshield wiper speed control relay to close and apply B+ to the windshield wiper motor through the windshield wiper high speed control circuit, enabling high speed wiper operation.

When the windsheild wiper request is no longer present, the contacts in the windshield wiper relay and windshield wiper speed control relay will open, removing B+ from the wiper motor control circuits. The windshield wiper motor will continue to operate using a discrete B+ circuit provided by the BCM until the wipers are in the park position.

Conditions for Running the DTC

• A wiper output is actively being requested by the BCM.
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B3715 01

A short to voltage is detected in the windshield wiper relay control circuit.

B3715 02

A short to ground is detected in the windshield wiper relay control circuit.

B3715 04

An open or high resistance is detected in the windshield wiper relay control circuit.

B3875 01

A short to voltage is detected in the windshield wiper high speed relay control circuit.

A short to ground is detected in the windshield wiper high speed relay control circuit.

A short to ground is detected in the windshield wiper high speed relay control circuit.

B3875 04

An open or high resistance is detected in the windshield wiper high speed relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the wiper output.

Conditions for Clearing the DTC

• A current DTC will clear when the condition for setting the fault is no longer present.
• A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the scan tool Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers.

• If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

• If the parameter changes

3. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers.

• If the parameter does not change

Test or replace the S82 Windsheild Wiper/Washer Switch.

• If the parameter changes

4. Verify the scan tool Windshield Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers.

• If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction.

• If the parameter changes

5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High.

• If the Windshield Wiper Motor does not cycle between Off, Low, and High

Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction

• If the Windshield Wiper Motor cycles between Off, Low, and High

6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active

• If the parameter does not change

Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction.

• If the parameter changes

8. All OK.

Circuit/System Testing

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 1 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.
• If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Wiper High Speed Switch parameter is Active.

• If not Active

1. Ignition OFF, remove the jumper wire, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.
• If Active

7. Test for greater than 8 V between the signal circuit terminal 3 and ground.

• If less than 8 V

1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit and ground

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

3. 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 K9 Body Control Module.
• If 8 V or greater

8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground.

• If 1 V or greater

Repair the short to voltage on the circuit.

• If less than 1 V

10. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF.
2. 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

3. Ignition ON.
4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the M75 Windshield Wiper Motor signal circuit terminal 2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.
• If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
6. Verify the scan tool Windshield Wiper Park Switch parameter is Active.

• If not Active

1. Ignition OFF, remove the jumper wire, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.
• If Active

7. Connect a test lamp between the following control circuits and ground, ignition ON.

• Control Circuit Terminal 4
• Control Circuit Terminal 5

8. Verify the test lamp does NOT turn ON and OFF when commanding the appropriate Windshield Wiper Relay On and Off with a scan tool.

• If the test lamp turns ON and OFF for both terminals

Test or replace the M75 Windshield Wiper Motor.

• If the test lamp does not turn ON and OFF for one or both terminals

9. Ignition OFF and all vehicle systems OFF, connect the harness connector at the M75 Windshield Wiper Motor. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
10. Test for less than 10 ohms between the ground circuit terminals listed below and ground:

• Terminal C5
• Terminal H1
• If 10 ohms or greater

1. Ignition OFF.
2. 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

11. Ignition ON.
12. Verify the M75 Windshield Wiper Motor is not activated.

• If the M75 Windshield Wiper Motor is activated

1. Ignition OFF, disconnect the harness connector at the M75 Windshield Wiper Motor, ignition ON.
2. Test for less than 1 V between each control circuit listed below and ground:

• Terminal 4
• Terminal 5
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the M75 Windshield Wiper Motor.
• If the M75 Windshield Wiper Motor is not activated

13. Connect a 20 A fused jumper wire between the control circuit terminals listed below, one at a time, and B+.

• Terminal H2
• Terminal C1

14. Verify the M75 Windshield Wiper Motor activates

• If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M75 Windshield Wiper Motor.
2. 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

3. 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 M75 Windshield Wiper Motor.
• If the M75 Windshield Wiper Motor activates

15. Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
16. Verify the M75 Windshield Wiper Motor low speed is not activated.

• If the M75 Windshield Wiper Motor low speed is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal D3 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 M75 Windshield Wiper Motor low speed is not activated

17. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
18. Verify the M75 Windshield Wiper Motor High Speed is not activated.

• If the M75 Windshield Wiper Motor high speed is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for infinite resistance between the control circuit terminal D2 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the X50A Fuse Block - Underhood.
• If the M75 Windshield Wiper Motor high speed is not activated

19. Connect a 10 A fused jumper wire between the control circuit terminal 16 X4 and B+.
20. Verify the M75 Windshield Wiper Motor activates.

If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.
• If the M75 Windshield Wiper Motor activates

21. Connect a 10 A fused jumper wire between the control circuit terminal 24 X5 and ground.
22. Verify the M75 Windshield Wiper Motor activates.

• If the M75 Windshield Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for less than 1 V between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.
• If the M75 Windshield Wiper Motor activates

23. Replace the K9 Body Control Module.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the switch in the open position.

If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

If infinite resistance

3. Test for less than 2 ohms between the signal circuit terminal 1 and the low reference circuit terminal 2 with the switch in the closed position.

• If 2 ohms or greater

Replace the S82 Windshield Wiper/Washer Switch.

• If less than 2 ohms

4. Test for infinite resistance between the signal terminal 3 and the low reference terminal 2 with the switch in the open position.

• If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

• If infinite resistance

5. Verify the resistance readings are within the specified range listed below between the signal circuit terminal 3 and the low reference circuit terminal 2 by pushing the switch in the listed positions below.

• Delay 1 : 3.75-3.85kohms
• Delay 2 : 2.75-2.85kohms
• Delay 3 : 1.95-2.05kohms
• Delay 4 : 1.25-1.35kohms
• Delay 5 : 765-775ohms
• If not within the specified range

Replace the S82 Windshield Wiper/Washer Switch.

• If within the specified range

6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Windshield Wiper Motor Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

Washer 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.

DTC Descriptors

DTC B3873

Front Washer Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the windshield washer based on an input from the windshield washer switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield washer switch through a discrete signal circuit. When the washer switch is pressed, the signal circuit is pulled to ground. The BCM will respond by commanding the washer function.

The windshield washer uses a single windshield washer pump to provide fluid for both the front and rear washers. Changing the polarity of the motor will cause it to spin in opposite directions, feeding fluid to the front or rear. When front washers are requested, the BCM applies voltage to the windshield washer pump relay control circuit. This causes the contacts in the windshield washer pump relay to close and supplies voltage to the windshield washer pump. Ground for the windshield washer pump is provided through the rear window washer pump relay, which is switched to ground in it's at-rest state.

Conditions for Running the DTC

• Ignition ON.
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B3873 01

A short to voltage has been detected on the windshield washer pump relay control circuit

B3873 02

A short to ground has been detected on the windshield washer pump relay control circuit

B3873 04

An open/high resistance has been detected on the windshield washer pump relay control circuit

Action Taken When the DTC Sets

Washer operation is suspended

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify Windshield Washer pump does not activate

• If Windshield Washer Pump Activates,

Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

• If Windshield Washer Pump does not Activate

3. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing and releasing the washer switch.

• If the parameter does not change

Refer to Circuit/System Testing - Washer Switch Malfunction.

• If the parameter changes

4. Verify the G24 Windshield Washer Pump activates when commanding the Windshield Washer Relay Active with a scan tool.

• If the Windshield Washers do not turn ON

Refer to Circuit/System Testing - Windshield Washer Pump Malfunction

• If the Windshield Washers turn ON

5. All OK.

Circuit/System Testing

Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Windshield Washer Switch parameter is Inactive.

If not Inactive

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit terminal 5 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.
• If Inactive

5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.

   6. Verify the scan tool Windshield Washer Switch parameter is Active.

• If not Active

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.

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

3. 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 K9 Body Control Module.
• If Active

7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Washer Pump Malfunction

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

• If 10 ohms or greater

1. 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

2. Connect the X2 harness connector and disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
3. Test for infinite resistance between each of the control circuit terminals listed below and ground.

• Terminal G3
• Terminal H3
• If less than Infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

5. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
6. Test for less than 1 V between the control circuit terminals listed below and ground:

• Terminal 1
• Terminal 2
• If 1 V or greater

1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
2. 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, test or replace the X50A Fuse Block - Underhood.
• If less than 1 V

7. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between the control circuit terminal 1 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

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

• If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 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 does NOT turn ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.
• If the test lamp turns ON and OFF

Test or replace the G24 Windshield Washer Pump.

• If the test lamp does not turn ON and OFF

12. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
13. Connect a test lamp between the control circuit terminal G9 and ground.
14. Verify the test lamp turns ON and OFF when commanding the Windshield Washer Relay Active with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp. Disconnect the X4 harness connector at the K9 Body Control Module.
2. 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.

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

• If 2 ohms or greater, repair the short to ground on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module
• If the test lamp is always ON

1. Ignition OFF, remove the test lamp. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 2 ohms or greater, repair the short to voltage on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module
• If the test lamp turns ON and OFF.

15. Test or replace the X50A Fuse Block - Underhood.

Component Testing

Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position.

• If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

• If infinite resistance

3. Test for less than 2 ohms between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position.

• If 2 ohms or greater

Replace the S82 Windshield Wiper/Washer Switch.

• If less than 2 ohms

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Compartment Fuse Block Replacement
• Windshield Washer Pump Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

Rain sensor 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.

DTC Descriptors

DTC B370A

Rain Sensor

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

B+ and ground is supplied at all times to the rain sensor. The rain sensor communicates with the body control module (BCM) via serial data. When the ignition is in the ON or ACCESSORY position and the windshield wiper/washer switch is in the intermittent delay position, the BCM monitors the rain sensor to determine the rain build up on the windshield. As rain builds up on the windshield, the BCM will command the wipers to activate. The sensitivity of the wiper frequency is controlled by the intermittent delay of the windshield wiper/washer switch. As the sensitivity is increased, the BCM will command more frequent wiper activation based on rain build up on the windshield.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify DTC B370A is not set.

• If DTC B370A is set

Refer to DTC B370A.

• If DTC B370A is not set

3. Verify DTC U151A is not set.

• If DTC U151A is set

Please Refer to DTC U1500-U15FF .

• If DTC U151A is not set

4. Verify the windshield wipers operate at low speed when the S82 Windshield Wiper/Washer Switch is in the LO position.

• If the windshield wipers are not operating at low speed

Refer to Windshield Wiper System Malfunction.

• If the windshield wipers are operating at low speed

5. Place the S82 Windshield Wiper/Washer Switch in the intermittent delay setting and spray the outside of the windshield in the area of the B117 Rain Sensor with a water bottle. It may be necessary to increase the sensitivity of the intermittent delay to achieve windshield wiper operation.
6. Verify the windshield wipers operate at low speed.

• If the wipers are not operating at low speed

Test or replace the B117 Rain Sensor.

• If the wipers are operating at low speed

7. All OK.

Circuit/System Testing

• Ignition OFF, all vehicle systems OFF, disconnect the harness connector at the B117 Rain Sensor. It may take up to 2 min for all vehicle systems to power down.
• Test for less than 10 ohms between the ground circuit terminal 3 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. 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

3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

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

1. Ignition OFF, remove the test lamp.
2. 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

1. Ignition OFF, remove the test lamp.
2. 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 B117 Rain Sensor.
• If the test lamp illuminates

5. Test for 4.0-12.0 V between the serial data circuit terminal 2 and ground.

• If less than 4.0 V

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the serial data circuit and ground.

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

3. Test for less than 2 ohms in the serial data circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If greater than 12.0 V

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the serial data circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 Body Control Module.
• If between 4.0-12.0 V

6. Test or replace the B117 Rain Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Windshield Outside Moisture Sensor Replacement
• Control Module References for body control module replacement, programming, and setup.

Rear wiper system 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

DTC Descriptor

DTC B370B

Rear Wiper Function Control Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the rear wiper motor based on an input from the rear wiper switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. The BCM monitors applies and monitors voltage on the rear wiper switch signal circuit. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.

The rear wiper motor is controlled by the BCM through the rear wiper relay. A constant B+ and ground are supplied to the rear wiper motor. When rear wiper operation is requested, the BCM will apply voltage to the rear wiper relay control circuit. This will cause the contacts in the rear wiper relay to close and apply B+ to the rear wiper motor through the rear wiper control circuit, enabling rear wiper operation. When the rear wiper request is no longer present, the contacts in the rear wiper relay will open, removing B+ from the rear wiper motor control circuit. The rear wiper motor will continue to operate using the constant B+ circuit until it is in the park position.

Conditions for Running the DTC

• Ignition ON
• The system voltage is between 9-16 V.

Conditions for Setting the DTC

B370B 01

A short to voltage is detected in the rear wiper relay control circuit

B370B 02

A short to ground is detected in the rear wiper relay control circuit.

B370B 04

An open or high resistance is detected in the rear wiper relay control circuit.

Action Taken When the DTC Sets

Rear wiper operation is disabled.

Conditions for Clearing the DTC

The DTC will clear when the conditions for setting the DTC are no longer present.

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the scan tool Rear Closure Ajar Switch parameter changes between Inactive and Active when opening and closing the liftgate.

• If the parameter does not change

Refer to Door Ajar Indicator Malfunction

• If the parameter changes

3. Verify the Scan Tool Rear Wiper Switch Parameter changes between ON and OFF when cycling the rear wiper switch ON and OFF.

• If the parameter does not change
• Refer to Circuit/System Testing - Rear Wiper/Washer Switch Malfunction
• If the parameter changes

4. Verify the M45 Rear Wiper Motor cycles when commanding the rear wiper ON with the rear wiper switch

• If the M45 Rear Wiper Motor does not cycle

Refer to Refer to Circuit/System Testing - Rear Wiper Motor Malfunction

• If the M45 Rear Wiper Motor cycles

5. Verify the M45 Rear Wiper Motor returns to the park position when the rear wipers are turned OFF

• If the M45 Rear Wiper Motor does not return to the park position

Refer to Circuit/System Testing - Rear Wiper Motor Malfunction

• If the M45 Rear Wiper Motor returns to the park position

6. All OK.

Circuit/System Testing

Rear Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 Body Control Module.
• If less than 10 ohms

3. Ignition ON.
4. Test for greater than 8 V between the signal circuit terminal 4 and ground.

• If less than 8 V

1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit and ground

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

3. 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 K9 Body Control Module.
• If 8 V or greater

5. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
6. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 4 and ground.

• If 1 V or greater

Repair the short to voltage on the circuit.

• If less than 1 V

7. Test or replace the S82 Windshield Wiper/Washer Switch.

Rear Wiper Motor Malfunction

1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the M45 Rear Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 3 and ground.

• If 10 ohms or greater

1. 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

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

• If the test lamp does not illuminate

1. Ignition OFF, remove the test lamp. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. 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 X50A Fuse Block - Underhood.
• If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 1 and ground.
6. Verify the test lamp does NOT turn ON and OFF when commanding the rear wiper ON and OFF with the rear wiper switch.

• If the test lamp turns ON and OFF

Test or replace the M45 Rear Wiper Motor.

• If the test lamp does not turn ON and OFF

7. Ignition OFF, connect the harness connector at the M45 Rear Wiper Motor. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between each ground circuit terminal listed below and ground:

• Terminal C5
• Terminal H5
• If 10 ohms or greater

1. 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

9. Ignition ON.
10. Verify the M45 Rear Wiper Motor is not activated.

• If the M45 Rear Wiper Motor is activated

1. Ignition OFF, disconnect the harness connector at the M45 Rear Wiper Motor, ignition ON.
2. Test for less than 1 V between the control circuit terminal 1 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the M45 Rear Wiper Motor.
• If the M45 Rear Wiper Motor is not activated

11. Connect a 20 A fused jumper wire between both of the circuits listed below and B+.

• B+ Circuit Terminal H4
• Control Circuit Terminal H3

125. Verify the M45 Rear Wiper Motor activates.

• If the M45 Rear Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the M45 Rear Wiper Motor, ignition ON.
2. 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

3. 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 M45 Rear Wiper Motor.
• If the M45 Rear Wiper Motor activates

13. Ignition OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
14. Verify the M45 Rear Wiper Motor is not activated.

• If the M45 Rear Wiper Motor is activated

1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal 10 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 M45 Rear Wiper Motor is not activated

15. Connect a 10 A fused jumper wire between the control circuit terminal 10 and B+.
16. Verify the M45 Rear Wiper Motor activates.

• If the M45 Rear Wiper Motor does not activate

1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit and ground.

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

3. 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 X50A Fuse Block - Underhood.
• If the M45 Rear Wiper Motor activates

17. Test or replace the K9 Body Control Module.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 4 and the low reference terminal 2 with the rear wiper switch in the OFF position.

• If less than infinite resistance

Replace the S82 Windshield Wiper/Washer Switch.

• If infinite resistance

3. Verify the resistance is within the range specified below between the signal circuit terminal 4 and the low reference circuit terminal 2 by cycling the switch between Rear Wiper position and Rear Washers position.

• Rear Wiper : 624-644 ohms
• Rear Wiper Sweep : 1.8-2.2 kohms
• Rear Washer : 5.9-6.4 kohms
• If not within the specific range

Replace the S82 Windshield Wiper/Washer Switch.

• If within the specific range

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Rear Window Wiper Motor Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

Rear washer system 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.

DTC Descriptor

DTC B3811

Rear Washer Relay Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) controls the rear washer based on an input from the rear wiper switch, which is part of the windshield wiper/washer switch. The BCM monitors the windshield wiper/washer switch through two separate signal circuits and a low reference circuit. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. The BCM monitors applies and monitors voltage on the rear wiper switch signal circuit. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.

The windshield washer uses a single windshield washer pump to provide fluid for both the front and rear washers. Changing the polarity of the motor will cause it to spin in opposite directions, feeding fluid to the front or rear. When rear washers are requested, the BCM applies voltage to the rear window washer pump relay control circuit. This causes the contacts in the rear washer pump relay to close and supplies voltage to the windshield washer pump. Ground for the windshield washer pump is provided through the windshield washer pump relay, which is switched to ground in it's at-rest state.

Conditions for Running the DTC

• Ignition ON
• The system voltage is between 9-16 V

Conditions for Setting the DTC

B3811 01

A short to voltage has been detected on the rear window washer pump relay control circuit

B3811 04

A open/high resistance has been detected on the rear window washer pump relay control circuit

Action Taken When the DTC Sets

Rear washer operation is disabled.

Conditions for Clearing the DTC

• A current DTC clears when the diagnostic runs and passes.
• A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Diagnostic Aids

The rear liftgate must be closed in order for the rear wiper to work

Reference Information

Schematic Reference

Wiper/Washer Schematics (Encore), Wiper/Washer 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

Wiper/Washer System 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

1. Ignition ON.
2. Verify the Scan Tool Rear Closure Ajar Switch Parameter changes between Inactive and Active when Opening and closing the liftgate.

• If the parameter does not change

Refer to Door Ajar Indicator Malfunction

• If the parameter changes

3. Verify the scan tool Rear Wiper Switch parameter changes between On and Off when cycling the rear wiper switch ON and OFF.

• If the parameter does not change

Refer to Rear Wiper System Malfunction

• If the parameter changes

4. Verify the G24 Windshield Washer Pump turns on and off when commanding the rear washers OFF and ON with the rear washer switch

• If the Rear Window Washers do not turn ON

Refer to Circuit/System Testing

• If the Rear Window Washers turn ON

5. All OK.

Circuit/System Testing

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

• If 10 ohms or greater

1. 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

3. Connect the X2 harness connector and disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
4. Test for infinite resistance between each of the control circuit terminals listed below and ground

• Terminal G3
• Terminal H3
• If less than Infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

5. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
6. Test for less than 1 V between the control circuit terminals listed below and ground:

• Terminal 1
• Terminal 2
• If 1 V or greater

1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
2. 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, test or replace the X50A Fuse Block - Underhood.
• If less than 1 V

7. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between the control circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

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

• If 10 ohms or greater

1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
2. 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 less than 10 ohms

10. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
11. Verify the test lamp does NOT turn ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.

• If the test lamp turns ON and OFF

Test or replace the G24 Windshield Washer Pump.

• If the test lamp does not turn ON and OFF

12. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
13. Connect a test lamp between the control circuit terminal G2 and ground.
14. Verify the test lamp turns ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp. Disconnect the X1 harness connector at the K9 Body Control Module.
2. 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.

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

• If 2 ohms or greater, repair the short to ground on the circuit.
• If less than 2 ohms, replace the K9 Body Control Module
• If the test lamp is always ON

1. Ignition OFF, remove the test lamp. Disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 2 ohms or greater, repair the short to voltage on the circuit
• If less than 2 ohms, replace the K9 Body Control Module
• If the test lamp turns ON and OFF.

15. Test or replace the X50A Fuse Block - Underhood.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Windshield Washer Pump Replacement
• Front Compartment Fuse Block Replacement
• Windshield Wiper and Washer Switch Replacement (Encore), Windshield Wiper and Washer Switch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

WIPER BLADE ELEMENT CHECK

Fig. 7: Identifying Wiper Blade Element

1. Remove the wiper blades from the wiper arms. Refer to Windshield Wiper Blade Replacement.
2. Look down the length of the blade element.
3. Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade +/-15 degrees.
4. Install the wiper blades on the wiper arms. Refer to Windshield Wiper Blade Replacement.

READ NEXT: