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DTC B2652

DTC B2652

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.


DTC Descriptor

DTC B2652 02

Passenger Compartment Dimming 3 Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Interior Accent Light Control B2652 02 2 1 -
1. Interior Accent Light at Full Intensity and Does Not Dim 2. Interior Accent Light do Not Illuminate


Circuit/System Description

The body control module (BCM) uses the ambient light sensor to determine which brightness of the accent lighting is needed. The BCM applies a pulse width modulated (PWM) voltage through the accent light LED control circuit. Depending on the specified lighting requirements, the BCM has three different accent lighting settings:


• Daylight conditions (70%)

• Night conditions (40%)

• Welcome light (100%)


Conditions for Running the DTC


• The ignition is ON.

• The headlamps or park lamps ON.


Conditions for Setting the DTC

The BCM detects a short to ground on the accent lighting control circuit.

Action Taken When the DTC Sets

The BCM does not attempt to illuminate the accent lighting.

Conditions for Clearing the DTC


• The condition responsible for setting the DTC no longer exists.

• A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.


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 connectors at the appropriate E1 accent light.

2. Test for less than 5 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. Ignition OFF, doors closed, wait 20 seconds before testing for less than 0.3 V between the control circuit terminal and ground.

5. If greater than the specified value, test the circuit for a short to voltage. If the circuits test normal, replace the K9 BCM.

6. Ignition ON, doors open, test for greater than 11 V between the control circuit terminal and ground.

7. If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.

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


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