Buick Encore: Bolted Exterior Body Panels and Closures - Diagnostic information and procedures

DTC B3006: Hood ajar circuit

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

HOOD LATCH WIRING SCHEMATICS (ENCORE)

Hood Latch

Fig. 1: Hood Latch

HOOD LATCH WIRING SCHEMATICS (Encore)

Hood Latch

Fig. 2: Hood Latch

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC B3006: HOOD AJAR CIRCUIT

DIAGNOSTIC CODE INDEX

DTC B3006: HOOD AJAR CIRCUIT

Diagnostic Instructions

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

DTC Descriptors

DTC B3006

Hood Ajar Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) applies B+ to the hood ajar signal circuit and monitors the voltage to determine the position of the hood. When the hood is closed, the switch is open and voltage remains high.

When the hood is open, the switch is closed and the voltage is pulled low.

Conditions for Running the DTC

The BCM continuously monitors for this DTC

Conditions for Setting the DTC

B3006 01

The BCM detects that the hood ajar switch signal circuit is shorted to battery.

B3006 02

The BCM detects that the hood ajar switch signal circuit is shorted to ground.

B3006 04

The BCM detects that the hood ajar switch signal circuit is open.

Action Taken When the DTC Sets

The hood ajar switch input will be ignored as a content theft deterrent trigger.

• Remote vehicle start (if equipped) will be disabled.

Conditions for Clearing the DTC

• A current DTC will clear when the conditions for setting the DTC are no longer present.
• A history DTC will clear after 40 malfunction free ignition cycles.

Reference Information

Schematic Reference

Immobilizer Schematics (Encore) , Immobilizer 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

Keyless Entry 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 Hood Ajar Switch parameter is Open when the hood is open and Closed when the hood is closed.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B55 Hood Ajar Switch. 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 C 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. Test for greater than 11.5 V between the signal circuit terminal B and ground.

If 11.5 V or less

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 greater than 11.5 V

5. Ignition OFF, disconnect the X4 and X7 harness connector at the K9 Body Control Module, ignition ON.
6. Test for less than 1 V between the signal circuit terminal B 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 B55 Hood Ajar Switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
2. Test for 2738-3350 ohms between the signal terminal A and the signal terminal B with the hood latch in the closed position.

If not between 2738-3350 ohms

Replace the B55 Hood Ajar Switch.

If between 2738-3350 ohms

3. Test for 658-806 ohms between the signal terminal A and the ground terminal C with the hood latch in the closed position.

If not between 658-806 ohms

Replace the B55 Hood Ajar Switch.

If between 658-806 ohms

4. Test for 2080-2545 ohms between the signal terminal B and the ground terminal C with the hood latch in the closed position.

If not between 2080-2545 ohms

Replace the B55 Hood Ajar Switch.

If between 2080-2545 ohms

5. Test for 2738-3350 ohms between the signal terminal A and the signal terminal B with the hood latch in the open position.

If not between 2738-3350 ohms

Replace the B55 Hood Ajar Switch.

If between 2738-3350 ohms

6. Test for 2080-2545 ohms between the signal terminal A and the ground terminal C with the hood latch in the open position.

If not between 2080-2545 ohms

Replace the B55 Hood Ajar Switch.

If between 2080-2545 ohms

7. Test for 658-806 ohms between the signal terminal B and the ground terminal C with the hood latch in the open position.

If not between 658-806 ohms

Replace the B55 Hood Ajar Switch.

If between 658-806 ohms

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Hood Primary and Secondary Latch Replacement (Encore), Hood Primary and Secondary Latch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

Symptoms - bolted exterior body panels and closures

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

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

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

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Hood Ajar Indicator Description and Operation.

Visual/Physical Inspection

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

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 Hood Ajar Indicator/Message Malfunction in order to diagnose the symptom.

HOOD AJAR INDICATOR/MESSAGE 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 B3006

Hood Ajar Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) applies B+ to the hood ajar signal circuit and monitors the voltage to determine the position of the hood. When the hood is closed, the switch is open and voltage remains high.

When the hood is open, the switch is closed and the voltage is pulled low.

Conditions for Running the DTC

The BCM continuously monitors for this DTC

Conditions for Setting the DTC

B3006 01

The BCM detects that the hood ajar switch signal circuit is shorted to battery.

B3006 02

The BCM detects that the hood ajar switch signal circuit is shorted to ground.

B3006 04

The BCM detects that the hood ajar switch signal circuit is open.

Action Taken When the DTC Sets

• The hood ajar switch input will be ignored as a content theft deterrent trigger.
• Remote vehicle start (if equipped) will be disabled.

Conditions for Clearing the DTC

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

A history DTC will clear after 40 malfunction free ignition cycles.

Reference Information

Schematic Reference

Immobilizer Schematics (Encore) , Immobilizer 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

Keyless Entry 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 Hood Ajar Switch parameter is Open when the hood is open and Closed when the hood is closed.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B55 Hood Ajar Switch. 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 C 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. Test for greater than 11.5 V between the signal circuit terminal B and ground.

If 11.5 V or less

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 greater than 11.5 V

5. Ignition OFF, disconnect the X4 and X7 harness connector at the K9 Body Control Module, ignition ON.
6. Test for less than 1 V between the signal circuit terminal B 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 B55 Hood Ajar Switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
2. Test for 2738-3350 ohms between the signal terminal A and the signal terminal B with the hood latch in the closed position.

If not between 2738-3350 ohms

Replace the B55 Hood Ajar Switch.

If between 2738-3350 ohms

3. Test for 658-806 ohms between the signal terminal A and the ground terminal C with the hood latch in the closed position.

If not between 658-806 ohms

Replace the B55 Hood Ajar Switch.

If between 658-806 ohms

4. Test for 2080-2545 ohms between the signal terminal B and the ground terminal C with the hood latch in the closed position.

If not between 2080-2545 ohms

Replace the B55 Hood Ajar Switch.

If between 2080-2545 ohms

5. Test for 2738-3350 ohms between the signal terminal A and the signal terminal B with the hood latch in the open position.

If not between 2738-3350 ohms

Replace the B55 Hood Ajar Switch.

If between 2738-3350 ohms

6. Test for 2080-2545 ohms between the signal terminal A and the ground terminal C with the hood latch in the open position.

If not between 2080-2545 ohms

Replace the B55 Hood Ajar Switch.

If between 2080-2545 ohms

7. Test for 658-806 ohms between the signal terminal B and the ground terminal C with the hood latch in the open position.

If not between 658-806 ohms

Replace the B55 Hood Ajar Switch.

If between 658-806 ohms

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Hood Primary and Secondary Latch Replacement (Encore), Hood Primary and Secondary Latch Replacement (Encore)
• Control Module References for body control module replacement, programming, and setup.

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