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DTC B2610

DTC B2610

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 has overviews of all diagnostic categories.


DTC Descriptor

DTC B2610 02

Passenger Compartment Dimming 1 Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
LED Interior Backlighting Control Terminal 8 X2

B2610 02

2

1

-

LED Interior Backlighting Control Terminal 9 X7

B2610 02

2

1

-

Backlighting Ground

-

2

-

-

1. Interior backlighting at full Intensity and cannot be dimmed

2. Interior backlighting do not Illuminate



Circuit/System Description

The body control module (BCM) supplies a reference voltage to the backlight dimmer switch, which is part of the headlamp switch. When the backlight dimmer switch is placed in a desired brightness position, reference voltage is applied through the backlight dimmer switch rheostat to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the backlight lamp control circuit, and the LED dimming control circuit illuminating the LEDs and the components listed below, if equipped:


• Heated Seat Control Module - Driver

• Dome/Reading Lamps

• Dome/Reading Lamps - Row

• Sunroof Switch

• Sunroof Sunshade Switch

• Rear Window Sunshade Switch

• Sunroof Ventilation Switch

• Intrusion Sensor Defeat Switch

• Outside Rearview Mirror Switch

• Window Switch - Driver

• Rear Compartment Lid Release Switch - Interior

• Window Switch - Passenger

• Window Switch - Left Rear

• Window Switch - Right Rear

• Steering Wheel Control Switch

• Headlamp Switch

• Park Brake Control Switch

• Ignition Mode Switch

• Automatic Transmission Shift Lever

• Hazard Warning Switch

• Multifunction Switch - Instrument Panel 1

• Multifunction Switch - Instrument Panel 2

• Steering Wheel Controls Switch - Left

• Steering Wheel Controls Switch - Right


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 LED backlight lamp control circuit.

Action Taken When the DTC Sets

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

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 information on diagnostic tools

Circuit/System Verification

Ignition ON, command the LED Backlight Dimming test with a scan tool. The illumination should be ON/OFF.

Circuit/System Testing


1. Ignition OFF, interior light switched OFF, disconnect the harness connectors at the appropriate inoperative backlighting component.

2. Test for less than 5 Ω between the black wire of the appropriate component 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 yellow wire of the appropriate component and ground.

5. Command with the scan tool the LED Backlight Dimming test the illumination ON/OFF.

6. If the test lamp cannot be dimmed test the control circuit for a short to voltage or replace the K9 Body Control Module.

7. If the test lamp do not emit at all test the control circuit for open/high resistance or replace the K9 Body Control Module.

8. If all circuit test normal, test or replace the appropriate inoperative backlighting component.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Dome and Reading Lamp Replacement

• Sunroof Switch Replacement

• Outside Remote Control Rearview Mirror Switch Replacement

• Front Side Door Window Switch Replacement

• Rear Side Door Window Switch Replacement

• Rear Compartment Lid Release Switch Replacement

• Steering Wheel Inflatable Restraint Module Replacement

• Headlamp Switch Replacement

• Hazard Warning Switch Replacement

• Body Control Module Replacement (Right Hand Drive) Body Control Module Replacement (Left Hand Drive)

• Control Module References for BCM, HVAC control module, and radio replacement, setup and programming.