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B2610




DTC B2610

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
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/System Description

The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference, signal, and B+ voltage reference circuits 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 a pulse width modulated (PWM) voltage through the light emitting diode (LED) dimming control circuits illuminating the interior backlighting to the requested level of brightness.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.
* Park lamps ON.

Conditions for Setting the DTC

DTC B2610 01

The BCM detects a short to battery in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 02

The BCM detects a short to ground in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

DTC B2610 04

The BCM detects an open/high resistance in the LED backlight dimming control circuit terminal 8 X2 or the LED backlight dimming control circuit terminal 9 X7.

Actions Taken When the DTC Sets

The BCM will disable the LED backlight dimming 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-free vehicle ON/OFF switch cycles have occurred.

Reference Information
Schematic Reference

Interior Lights Dimming Schematics Interior Lights Dimming Schematics
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Interior Lighting Systems Description and Operation Interior Lighting Systems
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Testing

Note: Each component supplied by the LED backlight dimming control circuits may need to be disconnected to isolate the short to ground. Use the schematics to identify the following:

* Each component control and ground circuit terminals
* Component locations on the LED backlight dimming control circuits

1. Vehicle OFF, disconnect the harness connector at any component with inoperative backlighting.
2. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 10 ohm between the appropriate ground circuit terminal listed below and ground:

* A20 radio/HVAC controls - terminal 17
* S16 driver information center switch - terminal 4
* E37F dome/reading lamps - front - terminal 6
* S25 garage door opener switch - terminal 3
* S48B garage door opener amber LED - terminal 6
* S70R steering wheel controls switch - right - terminal 5
* S70L steering wheel controls switch - left - terminal 7
* S91 park brake control switch - terminal 8
* S48B multifunction switch - overhead console - terminal 2
* S52 outside rearview mirror switch - terminal 11
* S113 charge port door open request switch - terminal 4
* S117 refuel request switch - terminal 4
* S83 vehicle ON/OFF switch - terminal 4

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the appropriate control circuit terminal listed below and ground:

* A20 radio/HVAC controls - terminal 18
* S16 driver information center switch - terminal 3
* E37F dome/reading lamps - front - terminal 3
* S25 garage door opener switch - terminal 2
* S48B garage door opener amber LED - terminal 3
* S70L steering wheel controls switch - left - terminal 6
* S70R steering wheel controls switch - right - terminal 4
* S91 park brake control switch - terminal 6
* S48B multifunction switch - overhead console - terminal 1
* S52 outside rearview mirror switch - terminal 1
* S113 charge port door open request switch - terminal 5
* S117 refuel request switch - terminal 5
* S83 vehicle ON/OFF switch - terminal 8

4. Vehicle in Service Mode, command the LED Backlight Dimming ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

5. If all circuits test normal, replace the component with inoperative backlighting.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Driver Information Display and Multifunction Switch Replacement Driver Information Display and Multifunction Switch Replacement
* Outside Remote Control Rearview Mirror Switch Replacement Service and Repair
* Radio Control Assembly Replacement Radio Control Assembly Replacement
* Radio and Telephone Control Switch Replacement Radio and Telephone Control Switch Replacement
* Accessory Switch Replacement Service and Repair
* Garage Door Opener Transmitter Pushbutton Replacement Garage Door Opener Transmitter Pushbutton Replacement
* Dome and Reading Lamp Replacement Service and Repair
* Parking Brake Switch Replacement Service and Repair
* Fuel Tank Filler Door Lock Release Switch Replacement Fuel Tank Filler Door Lock Release Switch Replacement
* Charger Door Release Switch Replacement Charger Door Release Switch Replacement
* Control Module References Programming and Relearning for BCM replacement, setup, and programming

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