The instrument panel (I/P) lamp dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the I/P lamps supply voltage circuit and the interior backlighting components dim to the requested level. Ground for the I/P dimmer switch is provided at G201.

DTC B2610 00 will set when the BCM detects a short to ground in the LED backlight dimming control circuit.

The BCM will not dim or illuminate any indicators supplied by the LED backlight dimming control circuit.

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the X4 harness connector at the BCM.
2. Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.

⇒	If not the specified value, test the B+ circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the X4 harness connector at the BCM.
4. Disconnect the X2 harness connector at the BCM.
5. Ignition ON, test for B+ between the B+ circuit terminal 2 and ground.

⇒	If not the specified value, test the B+ circuit for a short to ground or an open/high resistance.

6. Ignition OFF, connect the X2 harness connector at the BCM.
7. With a scan tool clear the DTC.
8. Ignition OFF, disconnect the harness connectors at the following components fed by the LED backlight dimming control circuit:

•	Driver information center (DIC) switch

•	HVAC control module

•	Rear window wiper/washer/fog lamp switch

•

Radio

•	Steering wheel control switch - left

•	Steering wheel control switch - right

•	Traction control switch (TCS)

•	HVAC Control Module - auxiliary - with C69

9. Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.

⇒	If the DTC resets, test the LED backlight dimming control circuit for a short to ground. If the circuits test normal, replace the BCM.

10. Reconnect each component one at a time and verify that the DTC does not reset as current.

⇒	If the DTC resets as current, test or replace the component responsible for setting the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.