Rear Compartment Lamp Malfunction

Rear Compartment Lamp 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

The body control module (BCM) applies battery voltage to the cargo lamp through the rear cargo lamp control circuit. When the BCM receives a rear liftgate open input from the rear liftgate latch, the BCM applies battery voltage to the rear cargo lamp control circuit illuminating the cargo lamp. In the event that the cargo lamp were to remain illuminated for more than 10 minutes with the vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the cargo lamp control circuit to prevent total battery discharge.

Reference Information

Schematic Reference

* Interior Lights Schematics Interior Lights Schematics

* Body Control System Schematics [1][2]Body Control Systems

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

Description and Operation

Interior Lighting Systems Description and Operation Interior Lighting Systems

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 Testing

1. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the E33 cargo lamp.

2. Test for less than 5 ohms between the ground circuit terminal 2 and ground.

• If 5 ohms or greater

1. Vehicle OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 5 ohms

3. Connect a test lamp between the control circuit terminal 1 and ground, vehicle in Service Mode.

4. Verify the test lamp turns ON and OFF when commanding the Cargo Lamp ON and OFF with a scan tool.

• If the test lamp is always OFF

1. Vehicle OFF, disconnect the X7 harness connector at the K9 body control module.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp is always ON

1. Vehicle OFF, disconnect the X7 harness connector at the K9 body control module, vehicle in Service Mode.

2. Test for less than 1 V between the control circuit terminal and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module.

• If the test lamp turns ON and OFF

5. Test or replace the E33 cargo lamp.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Rear Compartment Courtesy Lamp Replacement Rear Compartment Courtesy Lamp Replacement

* Control Module References Programming and Relearning for BCM replacement, programming, and setup