B2610
DTC B2610
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B2610 01
- Passenger Compartment Dimming 1 Circuit Short to Battery
DTC B2610 02
- Passenger Compartment Dimming 1 Circuit Short to Ground
DTC B2610 04
- Passenger Compartment Dimming 1 Circuit Open
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies a reference voltage through the 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 through the dimmer switch signal circuit 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 instrument panel cluster lamps and the components listed below, if equipped:
* Headlamp switch
* Electronic stability control switch
* Automatic transmission shift lever position indicator
* Steering wheel controls switch - left
* Steering wheel controls switch - right
* Passenger air bag disable indicator
* Door lock switch - driver
* Ignition mode switch
* Ultrasonic intrusion sensor disable switch
* Outside rearview mirror switch
* Rear compartment lid unlatch switch
* Sunroof switch
* Sunroof ventilation switch
Conditions for Running the DTC
* The ignition is ON.
* The headlamps or park lamps ON.
Conditions for Setting the DTC
B2610 01
The BCM detects a short to battery on the LED backlight lamp control circuit.
B2610 02
The BCM detects a short to ground on the LED backlight lamp control circuit.
B2610 04
The BCM detects an open circuit 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 after 100 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Interior Lighting Systems Description and Operation Interior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Ignition ON, vary the interior backlight from dim to full bright. The interior backlighting should dim and then become full bright.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connectors at the appropriate inoperative backlighting component.
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5 ohm between the black wire of the appropriate component and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Connect a test lamp between the control circuit of the appropriate component and ground.
6. Command with the scan tool the LED Backlight Dimming test ON/OFF.
• 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.
• If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 BCM.
7. If all circuit test normal, test or replace the appropriate inoperative backlighting component.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Outside Remote Control Rearview Mirror Switch Replacement Service and Repair
* Instrument Panel Inflatable Restraint Module Replacement Instrument Panel Inflatable Restraint Module Replacement
* Ignition and Start Switch Replacement Service and Repair
* Steering Wheel Inflatable Restraint Module Coil Replacement Removal and Replacement
* Control Module References Control Module References