B2610

DTC B2610

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy 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 00
- Passenger Compartment Dimming 1 Circuit



Diagnostic Fault Information





Circuit/System Description

The body control module (BCM) supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp 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 lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a variable voltage through the backlight lamp control circuit illuminating the components listed below:

* Clock
* Diver information center (DIC) switch
* Headlamp switch
* HVAC control head
* Rear HVAC control
* Radio
* Steering wheel control switch


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 backlight lamp control circuit.

Action Taken When the DTC Sets

The BCM will not DIM or illuminate any 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 (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 backlight lamps should dim and then become full bright.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at all components fed by the backlight lamp control circuits listed below.

* Backlight lamp control terminal 18 X3
* Backlight lamp control terminal 21 X6

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 control circuits for a short to ground. If the circuits test normal, replace the BCM.

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

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



Repair Instructions

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

* Driver Information Display Switch Replacement (Service and Repair)
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM, HVAC control module, and radio replacement, setup, and programming