Diagnostic Instructions

DTC Descriptors

DTC B2610 00: Passenger Compartment Dimming 1 Circuit

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	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
LED Dimming Supply	B2610 00 or B2610 02	B2610 00 or B2610 04	B2610 00 or B2610 01	--
LED Backlighting Ground	--	1	--	--
1. Interior Backlighting Inoperative

Circuit/System Description

When the instrument panel lamps dimmer switch is activated, a variable voltage signal is applied through the LED dimmer switch signal circuit to the body control module (BCM). The BCM then applies a message on the low speed GMLAN serial data communication circuit to the door switches to illuminate the switch backlighting. The BCM, driver door switch, and passenger door switch then applies a variable voltage signal through the LED dimming supply circuit to the components on that circuit.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM, driver door switch, and passenger door switch detects a short to voltage, short to ground, or an open on the LED dimming supply circuit.

Action Taken When the DTC Sets

The BCM, driver door switch, and passenger door switch will cease attempts to dim or illuminate the LED lamps.

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Circuit/System Verification

Ignition and park lamps ON, vary the interior lamp dimming switch from dim to full bright. The LED lamps should dim and then become full bright.

Circuit/System Testing

1. Park lamps OFF, disconnect all of the LED dimming supply circuit lamp components on the circuit.
2. Park lamps ON, verify that DTC B2610 00, B2610 01, and DTC B2610 02 does not reset.

⇒	If the DTC resets, test for a short to voltage, short to ground, or an open in the LED dimming supply circuit. If the circuit/connections test normal, replace the BCM, driver door switch, and passenger door switch as applicable.

3. Reconnect each component one at a time and test for DTC B2610 00, B2610 01 and DTC B2610 02.

⇒	If the DTC resets, replace that particular component.

⇒	If the DTC does not reset, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.