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 |
|---|---|---|---|---|
Left Front Door Ajar Switch Signal | B2976 00 | 2 | 2 | -- |
Left Rear Door Ajar Switch Signal | B2996 00 | 2 | 2 | -- |
Right Front Door Ajar Switch Signal | B2991 00 | 2 | 2 | -- |
Right Rear Door Ajar Switch Signal | B3001 00 | 2 | 2 | -- |
Cargo Door Ajar Switch Signal | 1 | 2 | 2 | -- |
Driver Door Lock Ground | -- | 2 | 2 | -- |
LR Door Jamb Switch Ground | -- | 2 | 2 | -- |
Front Passenger Door Lock Ground | -- | 2 | 2 | -- |
RR Door Jamb Switch Ground | -- | 2 | 2 | -- |
Cargo Door Latch Assembly Ground | -- | 2 | 2 | -- |
1. Door Ajar Indicator Always Illuminated 2. Door Ajar Indicator Inoperative | ||||
Circuit/System Description
The body control module (BCM) monitors each door ajar circuit to indicate the status of the door. When the respective door is opened, the door ajar signal circuit is switched to ground by the door lock ajar indicator switch, the BCM detects the drop in voltage in the circuit and 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 when the transmission is shifted out of PARK, the DIC will also send a serial data message to the radio to activate the door ajar audible warning.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Door Ajar Indicator Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Observe the scan tool Rear Closure Ajar Sw parameter while opening and closing the rear cargo door. The parameter should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the X1 harness connector at the cargo door latch.
- Test for less than 1 ohm between the ground circuit terminal A and ground.
- Ignition ON, verify the scan tool Rear Closure Ajar Sw parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal C and ground.
- Verify the scan tool Rear Closure Ajar Sw parameter is Active.
- If all circuits test normal, test or replace the cargo door latch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Component Testing
- Ignition OFF, disconnect the X1 harness connector at the cargo door latch.
- Test for infinite resistance between the signal terminal C and the ground terminal A with the door ajar switch in the open position.
- Test for less than 2 ohms between the signal terminal C and the ground terminal A with the door ajar switch in the closed position.
| ⇒ | If not the specified value, replace the cargo door latch. |
| ⇒ | If greater than the specified range, replace the cargo door latch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup and programming
