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
IS LPS Fuse B+	B1395 03	B1395 03	--	--
Headlamp and Panel Dimmer Switch Signal	B1395 03	1	1	--
I/P Lamps Dimmer Switch Signal	B2652 00	1	1	--
I/P Dimming Voltage Reference	B1395 03	1	1	--
Indicator Dimming Control	B2625 00	1	1	--
LED Backlight Dimming Control	B2610 00	1	1	--
Headlamp and Panel Dimmer Switch Ground	--	1	--	--
1. Interior Backlighting Malfunction

Circuit/System Description

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.

Conditions for Running the DTC

Conditions for Setting the DTC

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

Actions Taken When the DTC Sets

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

Conditions for Clearing the DTC

Reference Information

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

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate component.
2. Verify that a test lamp illuminates between the listed ground circuit terminal and B+.

•	Left steering wheel switch terminal 8

•	Right steering wheel switch terminal 1

•	PTO switch terminal 5

•	Trailer brake controller switch terminal 8

•	DIC switch terminal 5

•	HVAC control module terminal 10 X2

•	I/P multifunction switch terminal 3

⇒	If the test lamp does not illuminate, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the listed LED dimming control circuit terminal and ground.

•	Left steering wheel switch terminal 6

•	Right steering wheel switch terminal 2

•	PTO switch terminal 6

•	Trailer brake controller switch terminal 7

•	DIC switch terminal 4

•	HVAC control module terminal 1 X2

•	I/P multifunction switch terminal 4

4. Command the dimming test high to low with a scan tool. The test lamp should turn from bright to dim when changing between the commanded states.

⇒	If the test lamp is always off, test the control circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always bright, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, test or replace the appropriate component.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.