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 provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2610: Passenger Compartment Dimming 1 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Instrument Panel Lamp Supply Voltage | B2610 | 2 | 1 | -- |
1. Interior Backlighting Does Not Dim 2. Interior Backlighting Inoperative | ||||
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:
| • | HVAC control module |
| • | Radio |
| • | Driver window switch |
| • | Driver door lock switch |
| • | Outside rearview mirror switch |
| • | Traction control switch |
| • | PRNDL lamp |
| • | Head Up Display (HUD) switch (RPO UV6) |
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
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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
- Ignition OFF, disconnect the harness connectors at all components fed by the instrument panel lamp supply voltage circuit.
- Ignition ON, clear the DTC with a scan tool.
- Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
- Reconnect each component one at a time and verify that 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. |
| ⇒ | If the DTC resets, test or replace the component responsible for setting the DTC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
