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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Door Ajar Signal Circuit | 1 | 2 | -- | -- |
Door Ajar Ground Circuit | -- | 2 | 2 | -- |
1. Door Ajar Light Stays On 2. Door Ajar Light Will Not Come On | ||||
Circuit/System Description
The body control module (BCM) receives a discrete input from the respective jamb switch to indicate the status of the 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 warning when the transmission is removed from PARK and the vehicle speed is greater then 8.05 km/h (5 mph).
Diagnostic Aids
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 canceling 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.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool Door Ajar Sw parameter while opening and closing all doors. The reading should change between Door Ajar and Door Closed.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate door latch assembly.
- Test for less than 1 ohm of resistance between the appropriate door ajar switch ground circuit terminal H and ground.
- Ignition ON, doors closed, verify the scan tool Door Ajar Sw parameter for the appropriate door is Door Closed.
- Install a 3A fused jumper wire between the appropriate door ajar switch signal circuit terminal H and ground. Verify the scan tool Door Ajar Sw parameter is Door Ajar.
- If all circuits test normal, test or replace the appropriate door latch assembly.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the appropriate door ajar switch signal circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the appropriate door ajar switch signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPC and BCM replacement, setup, and programming |
