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Interior Accent Lighting Malfunction

Interior Accent Lighting Malfunction

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
Accent Lamp Control 1 1 2 -
Accent Lamp Ground - 1 - -
1. Interior Accent Lighting Inoperative 2. Interior Accent Lighting Always ON


Circuit/System Description

The body control module (BCM) uses the ambient light sensor to determine which brightness of the accent lamps is needed. The BCM provides B+ voltage to the individual accent lamps via the accent lamps control circuit.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, command the Accent Lighting ON and OFF with a scan tool. The accent lighting should turn ON and OFF when changing between the commanded states.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the appropriate E1 accent lamp.

2. Test for less than 5.0 Ω between the ground circuit terminal and ground.

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

4. Connect a test lamp between the control circuit terminal and ground.

5. Ignition ON, command the Accent Lighting ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

7. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

8. If all circuits test normal, replace the E1 accent lamp.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Refer to the appropriate replacement procedure for the lighting component that requires replacement.

• Control Module References for BCM replacement, programming and setup