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.

### Circuit/System Description

The body control module (BCM) receives an input from all four door ajar switches, drivers, passengers, left rear, and right rear. The door ajar switches are normally open when the doors are fully closed. When a door is opened, the door ajar switch contacts close providing a path to ground. The driver information center (DIC) on the instrument panel cluster (IPC), illuminates the door ajar message when the one of the doors is open. The IPC receives a serial data message from the BCM, indicating the door ajar status. If this message is displayed and the vehicle speed is greater than 8.1 km/h (5 mph), a chime will sound.

### Reference Information

#### Schematic Reference

• | Instrument Cluster Schematics

• | Door Lock/Indicator Schematics

#### Connector End View Reference

• | Displays and Gages Connector End Views

• | Vehicle Access Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the four door ajar switch assemblies.
2. Ignition OFF, test for less than 1.0 ohm of resistance between each of the four ground circuits and ground.

⇒ | If any of the ground circuits are greater than 1.0 ohm, test that ground circuit for an open/high resistance.

3. Verify all the scan tool Door Ajar Switch parameters show Door Closed.

⇒ | If not Door Closed, test the appropriate signal circuit for a short to ground. If the circuits test normal, replace the BCM.

4. Install a 3-amp fused jumper one at a time between the four signal circuits and ground. Verify that each scan tool Door Ajar Switch parameter is Door Ajar when each signal circuit is jumpered.

⇒ | If not Door Ajar, test the appropriate signal circuit for a short to voltage or an open/high resistance. If all circuits test normal, replace the BCM.

5. Ignition OFF, reconnect the harness connectors at the four door ajar switch assemblies, one at a time. Open and close the door with the reconnected harness. Verify that each scan tool Door Ajar Switch parameter is Door Ajar when the door is open and Door Closed when the door is closed.

⇒ | If not Door Ajar when open or Door Closed when closed, replace the appropriate door ajar switch assembly.

6. If all circuits test normal, test or replace the IPC.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM or IPC replacement, setup, and programming