Service Information

Orlando

DTC B2610

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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 Interior Backlighting Control Terminal 8 X2	B2610 02	B2610 04	B2610 01	--
LED Interior Backlighting Control Terminal 9 X7	B2610 02	B2610 04	B2610 01	--
Backlighting Ground	--	1	--	--
1. Interior Backlighting Inoperative

Circuit/System Description

The body control module (BCM) supplies a voltage reference through the dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and through the dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the backlight lamp control circuit, and the LED dimming control circuit illuminating the LEDs and instrument panel cluster lamps and the components listed below, if equipped:

•	Headlamp switch

•	Electronic stability control switch

•	Automatic transmission selector lever position indicator

•	Steering wheel controls switch - left

•	Steering wheel controls switch - right

•	Passenger air bag disable indicator

•	Door lock switch - driver

•	Ignition mode switch

•	Ultrasonic intrusion sensor disable switch

•	Outside rearview mirror switch

•	Rear compartment lid unlatch switch

•	Sunroof switch

•	Sunroof ventilation switch

Conditions for Running the DTC

•	The ignition is ON.

•	The headlamps or park lamps ON.

Conditions for Setting the DTC

B2610 01

The BCM detects a short to battery on the LED backlight lamp control circuit.

B2610 02

The BCM detects a short to ground on the LED backlight lamp control circuit.

B2610 04

The BCM detects an open circuit on the LED backlight lamp control circuit.

Action Taken When the DTC Sets

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp 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 ignition cycles have occurred.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, vary the interior backlight from dim to full bright. The interior backlighting should dim and then become full bright.

Circuit/System Testing

Ignition OFF, disconnect the harness connectors at the appropriate inoperative backlighting component.
Disconnect the negative terminal of the C1 Battery.
Test for less than 5 Ω between the black wire of the appropriate component and ground.

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

Reconnect the negative terminal to the C1 Battery.
Connect a test lamp between the control circuit of the appropriate component and ground.
Command with the scan tool the LED Backlight Dimming test ON/OFF.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

⇒	If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 Body Control Module.

If all circuit test normal, test or replace the appropriate inoperative backlighting component.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Headlamp Switch Replacement

•	Outside Rearview Mirror Remote Control and Multifunction Switch Replacement

•	Radio Control Switch Replacement - Steering Wheel

•	Instrument Panel Inflatable Restraint Module Replacement

•	Door Lock Switch Replacement

•	Ignition and Start Switch Replacement

•	Steering Wheel Airbag Coil Replacement

•	Control Module References