Cargo Door Ajar Indicator Malfunction

Cargo Door Ajar Indicator Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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/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 transaxle is shifted out of PARK, the DIC will also send a serial data message to the radio to activate the door ajar audible warning.

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

1. Ignition OFF, disconnect the harness connector at the cargo door latch assembly.
2. Ignition ON, verify the scan tool Rear Closure Ajar Sw parameter is Inactive.

• If not the specified parameter, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.

3. Install a 3A fused jumper wire between the signal circuit terminal C and the ground circuit terminal A.
4. Verify the scan tool Rear Closure Ajar Sw parameter is Active.

• If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, test or replace the cargo door latch assembly.

Component Testing

1. Ignition OFF, disconnect the harness connector at the cargo door latch assembly.
2. Test for infinite resistance between the signal terminal C and the ground terminal A with the door ajar switch in the open position.

• If not the specified value, replace the cargo door latch assembly.

3. Test for less than 2.0 ohms between the signal terminal C and the ground terminal A with the door ajar switch in the closed position.

• If greater than the specified range, replace the cargo door latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests