Rear Compartment Lamp Malfunction

Rear Compartment Lamp Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category

Circuit/System Description

The rear compartment lamp is supplied voltage from the BCM via the inadvertent power courtesy lamp circuit. When the rear compartment lid is open, the rear compartment courtesy lamp switch is closed, providing a ground path for the rear compartment courtesy lamp and illuminating the lamp.

Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for Scan Tool Information

Circuit/System Verification

Ignition ON, open the rear compartment lid. The rear compartment courtesy lamp should illuminate.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear compartment courtesy lamp.
2. Ignition ON, verify a test lamp illuminates between the control circuit terminal A and ground.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

3. Ignition OFF, connect the harness connector at the rear compartment courtesy lamp. Disconnect the harness connector at the rear compartment lid latch.
4. Test for less than 10 ohms of resistance between the ground circuit terminal 3 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

5. Ignition ON, verify the rear compartment courtesy lamp is not illuminated.

• If the rear compartment courtesy lamp is illuminated, test the control circuit terminal 1 for a short to ground.

6. Install a 5A fused jumper wire between the control circuit terminal 1 and ground. Verify the rear compartment courtesy lamp is illuminated.

• If the rear compartment courtesy lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the test the rear compartment courtesy lamp bulb.

7. If all circuits test normal, test or replace the rear compartment lid latch.

Repair Instructions

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

* Rear Compartment Courtesy Lamp Replacement (Rear Compartment Courtesy Lamp Replacement)
* Rear Compartment Lid Ajar Indicator Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for BCM replacement, setup, and programming