B2610

Programming and Relearning

DTC B2610

DTC Descriptor
DTC B2610 00
- Passenger Compartment Dimming 1 Circuit

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview





Circuit/System Description

When the interior lamps dimming switch is activated, a variable voltage signal is applied through the instrument panel lamps dimmer switch signal circuit to the body control module (BCM). The BCM then applies a variable voltage pulse width modulated (PWM) signal through the LED dimming supply circuit to the HVAC control head, radio, driver information center (DIC) switch, cruise control switch and the steering wheel controls.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM receives a ground signal on the LED dimming supply circuit.

Action Taken When the DTC Sets

The BCM cease attempt to dim or illuminate the LED lamps.

Conditions for Clearing the DTC

The BCM clears this code from current when the fault is removed from the system.

Circuit/System Verification

Ignition ON, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The LED lamps in the HVAC control head, radio, DIC switch, and the steering wheel controls should dim and then become full bright.

Circuit/System Testing

1. Disconnect the HVAC control head. Verify the DTC resets.

• If the DTC does not reset, replace the HVAC control head.

2. Disconnect the radio. Verify the DTC resets.

• If the DTC does not reset, replace the radio.

3. Disconnect the DIC switch. Verify the DTC resets.

• If the DTC does not reset, replace the DIC switch.

4. Disconnect the cruise control switch. Verify the DTC resets.

• If the DTC does not reset, replace the cruise control switch.

5. Disconnect the steering wheel control switches. Verify the DTC resets.

• If the DTC does not reset, replace the steering wheel control switches.

6. Test for a short to ground in the LED Dimming Supply circuit.

• If all circuits/connections test normal, replace the BCM.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Driver Information Display Switch Replacement (Impala) Driver Information Display Switch Replacement (Monte Carlo)
* HVAC Module Assembly Replacement
* Radio Replacement
* Steering Wheel Control Switch Assembly Replacement
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