Trunk Ajar Indicator Malfunction
Trunk Ajar Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
When the ignition is ON, the body control module (BCM) supplies battery positive voltage to the rear compartment lid ajar switch through the rear compartment lid ajar switch signal circuit. When the rear compartment lid is opened, the signal circuit is connected to ground through the rear compartment lid ajar switch ground circuit and the voltage is pulled low within the BCM. In response, the BCM sends a serial data message to the driver information center (DIC) in the instrument panel cluster (IPC) to illuminate the rear compartment lid ajar indicator.
Reference Information
Schematic Reference
Release Systems Schematics Release Systems Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Door Ajar Indicator Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Trunk Ajar Switch parameter while opening and closing the trunk lid. The parameter should change between Trunk Ajar and Trunk Closed when opening and closing the trunk lid.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the rear compartment lid latch.
2. Ignition ON, verify the scan tool Trunk Ajar Switch parameter is Trunk Closed.
• If not the specified value, test the signal circuit terminal 2 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 2 and the ground circuit terminal 3. Verify the scan tool Trunk Ajar Switch parameter is Trunk Ajar.
• 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.
4. If all circuits test normal, test or replace the rear compartment lid latch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 3 with the ajar switch in the open position.
• If less than the specified value, replace the rear compartment lid latch.
3. Test for less than 3 ohms between the signal terminal 2 and the ground terminal 3 with the ajar switch in the closed position.
• If greater than the specified range, replace the rear compartment lid latch.
4. Test for infinite resistance between each terminal 2 and 3 and the rear compartment lid latch housing/case.
• If less than the specified value, replace the rear compartment lid latch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Rear Compartment Lid Latch Replacement Service and Repair
* Control Module References Programming and Relearning for BCM replacement, setup, and programming