B2976

DTC B2976

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B2976 00
- Driver Door Ajar Circuit

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) provides a 12V signal to each of the door ajar switch signal circuit. The door ajar switches are normally open when the door is fully closed. When a door is opened, the door ajar switch contacts close providing a path to ground. The driver information center (DIC) displays ajar icon when the BCM detects that one or more of the doors are open. The instrument panel cluster (IPC) receives a serial data message from the BCM indicating the door ajar status.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The BCM detects a short to ground in the driver door ajar circuit for longer than 10 minutes.

Action Taken When the DTC Sets

The door ajar indicator is on at all times.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will become a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Door Ajar Indicator Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool Driver Door Ajar Sw parameter changes between Door Closed and Door Open when opening and closing the driver door.

• 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 driver door latch. It may take up to 2 minutes 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. 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 Driver Door Ajar Sw parameter is Door Closed.

• If not Door Closed

1. Ignition OFF, disconnect the 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 Door Closed

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.

6. Verify the scan tool Driver Door Ajar Sw parameter is Door Open.

• If not Door Open

1. Ignition OFF, 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 Door Open

7. Test or replace the driver door latch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the driver door latch.

2. Test for infinite resistance between the signal terminal 1 and the ground terminal 3 with the switch in the open position

• If less than infinite resistance
Replace the driver door lock.

• If infinite resistance

3. Test for less than 3 ohms between the signal terminal 1 and the ground terminal 3 with the switch in the closed position.

• If 3 ohms or greater
Replace the driver door latch.

• If less than 3 ohms

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Front Side Door Latch Replacement Service and Repair

* Control Module References Control Module References for BCM replacement, setup, and programming