For 1990-2009 cars

### 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 B2976 00: Door Ajar Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Door Ajar Signal | B2976 00 | 1 | -- | --
Door Ajar Ground | -- | 1 | 1 | --
1. Door Ajar Indicator Inoperative

### Circuit/System Description

For vehicles without RPO AXC/AXE, the body control module (BCM) receives a discrete input from each of the 4 jamb switches and for vehicles with RPO AXC/AXE the BCM will only receive discrete input from the rear door jamb switches to indicate the status for each door. The BCM then communicates this status to the instrument panel cluster (IPC) via a serial data message. The IPC, upon receipt of this serial data message, will illuminate the appropriate ajar message in the driver information center (DIC) and also send a serial data massage to the radio to activate the door ajar audible warming when the transmission is removed from PARK and the vehicle speed is greater then 8 km/h (5 mph).

The door ajar switches supply a ground to the BCM when the door is open. Once the door is closed the door ajar switch opens removing the ground to the BCM. The BCM sends a signal to the IPC to turn on the door ajar light when a door is open.

### Conditions for Running the DTC

The system voltage is 9-16 volts.

### Conditions for Setting the DTC

• | Without RPO AXC/AXE: The BCM detects a short to ground on a door ajar signal circuit for greater than 10 minutes.

• | With RPO AXC/AXE: The BCM detects a short to ground on a rear door ajar signal circuit for greater 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Door Ajar Indicator 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

#### Without RPO AXC/AXE

Ignition ON, with all doors closed, observe the scan tool Driver Door Ajar Sw., Passenger Door Ajar Sw., Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters while opening and closing each door. The parameters should change between Door Closed and Door Ajar.

⇒ | If the parameters do not change, refer to Door Ajar Malfunction.

#### With RPO AXC/AXE

With the rear doors closed, observe the scan tool Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters while opening and closing each door. The parameters should change between Door Closed and Door Ajar.

⇒ | If the parameters do not change, refer to Rear Door Ajar Malfunction.

### Circuit/System Testing

#### Door Ajar Malfunction

1. Ignition ON, with all doors closed, verify the scan tool Driver Door Ajar Sw., Passenger Door Ajar Sw.,Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters are Door Closed.

⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.

• | Driver door latch terminal 6.

• | Left rear door latch terminal 4.

• | Passenger door latch terminal 1.

• | Right rear door latch terminal 1

2. If all circuits test normal, test or replace the appropriate door latch.

#### Rear Door Ajar Malfunction

1. Ignition ON, with all doors closed, verify the scan tool Left Rear Door Ajar Sw. and Right Rear Door Ajar Sw. parameters are Door Closed.

⇒ | If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.

• | Left rear door latch terminal 4.

• | Right rear door latch terminal 1

2. If all circuits test normal, test or replace the appropriate door latch.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. With the switch in the open position, test for infinite resistance between the signal terminal and the ground terminal listed below:

• | Driver door latch terminal 6 and terminal 8.

• | Left rear door latch terminal 4 and terminal 6.

• | Passenger door latch terminal 1 and terminal 3.

• | Right rear door latch terminal 1 and terminal 3.

⇒ | If not the specified value, replace the door latch.

3. With the switch in the closed position, test for less than 2.0 ohms between the signal and the ground terminals listed below:

• | Driver door latch terminal 6 and terminal 8.

• | Left rear door latch terminal 4 and terminal 6.

• | Passenger door latch terminal 1 and terminal 3.

• | Right rear door latch terminal 1 and terminal 3.

⇒ | If not the specified value, replace the door latch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Front Side Door Latch Replacement

• | Rear Side Door Latch Replacement

• | Control Module References for BCM replacement, setup, and programming