B2610

DTC B2610

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.



DTC Descriptor
DTC B2610
- Passenger Compartment Dimming 1 Circuit




Diagnostic Fault Information






Circuit/System Description

The BCM supplies a voltage reference through the I/P dimming voltage reference circuit to the interior lamp dimmer switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P dimming signal circuit to the BCM. The BCM interprets this voltage signal, then applies a variable voltage through the instrument panel lamp supply voltage circuit, illuminating the components listed below:

* Instrument Panel Cluster (IPC)
* HVAC control module
* Radio
* Headlamp switch
* Driver window switch
* Driver door lock switch
* Front passenger window switch
* Front passenger door lock switch
* Outside rearview mirror switch
* Traction control switch
* PRNDL lamp (console shift)
* Driver Information Center (DIC)
* Steering wheel controls (RPO UK3)



Conditions for Running the DTC

* The ignition is ON
* The headlamps or park lamps are ON



Conditions for Setting the DTC

The BCM detects a short to ground on the instrument panel lamp supply voltage circuit.


Action Taken When the DTC Sets

The BCM will not DIM or illuminate any backlighting.


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 (Interior Lights Dimming 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, cover the ambient light sensor. Adjust the interior lamp dimming switch from dim to full bright. The backlighting lamps should dim and then become full bright.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at all components fed by the instrument panel lamp supply voltage circuit.
2. Ignition ON, clear the DTC with a scan tool.
3. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.

• If the DTC resets, test the instrument panel lamp supply voltage circuit for a short to ground. If the circuit tests normal, replace the BCM.

4. Reconnect each component one at a time and verify that the DTC does not reset.

• If the DTC resets, test or replace the component responsible for setting the DTC.




Repair Instructions

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


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