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 00: Passenger Compartment Dimming 1 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Backlight Lamp Control | B2610 00 | 2 | 1 | -- |
1. Interior Backlighting Does Not Dim 2. Interior Backlighting Inoperative | ||||
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
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 backlight lamps should dim and then become full bright.
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at all components fed by the backlight lamp control circuits listed below.
- 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 as current.
| • | Backlight lamp control terminal 18 X3 |
| • | Backlight lamp control terminal 21 X6 |
| ⇒ | If the DTC resets, test the control circuits for a short to ground. If the circuits test normal, replace the BCM. |
| ⇒ | If the DTC resets as current, 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, HVAC control module, and radio replacement, setup, and programming |
