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 02
- Passenger Compartment Dimming 1 Circuit Short to Ground
Diagnostic Fault Information
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 resistor ladder to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage to the LED dimming supply circuit to all related interior lamps, illuminating them to the desired level of brightness.
* Heated seat control module - driver
* Dome/reading lamps
* Sunroof switch
* Rear window sunshade switch
* Intrusion sensor defeat switch
* Outside rearview mirror switch
* Window switches
* Headlamp switch
* Park brake control switch
* Ignition mode switch
* Automatic transmission shift lever
* Hazard warning switch
* Multifunction switch - instrument panel
* Steering wheel controls switches
* Universal garage door opener
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 Schematics (Interior Lights Schematics)
* Interior Lights Dimming Schematics (Interior Lights Dimming Schematics)
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 (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 (Programming and Relearning) for scan tool information
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, disconnect the harness connectors at the appropriate inoperative backlighting component.
2. 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.
3. Connect a test lamp between the yellow wire of the appropriate component and ground.
4. Command with the scan tool the LED Backlight Dimming test the illumination ON/OFF.
• If the test lamp cannot be dimmed test the control circuit for a short to voltage or replace the K9 Body Control Module.
• If the test lamp do not emit at all test the control circuit for open/high resistance or replace the K9 Body Control Module.
5. 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.
* Dome and Reading Lamp Replacement - Front (Dome and Reading Lamp Replacement - Front)
* Dome and Reading Lamp Replacement - Rear (Dome and Reading Lamp Replacement - Rear)
* Sunroof Switch Replacement (Service and Repair)
* Outside Remote Control Rearview Mirror Switch Replacement (Service and Repair)
* Front Side Door Window and Multifunction Switch Replacement (Front Side Door Window and Multifunction Switch Replacement)
* Rear Side Door Window Switch Replacement (Rear Side Door Window Switch Replacement)
* Headlamp Switch Replacement (Service and Repair)
* Parking Brake Switch Replacement (Service and Repair)
* Instrument Panel Multifunction Switch Replacement (Service and Repair)
* Radio and Telephone Control Switch Replacement (Radio and Telephone Control Switch Replacement)
* Cruise Control Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM, HVAC control module, and radio replacement, setup, and programming