B2652

DTC B2652

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Strategy Based Diagnosis
- Diagnostic Procedure Instructions Initial Inspection and Diagnostic Overview

DTC DESCRIPTOR

DTC B2652 00
Passenger Compartment Dimming 3

DIAGNOSTIC FAULT INFORMATION





CIRCUIT/SYSTEM DESCRIPTION
Voltage for the interior backlighting components is supplied from the CHMSL/BACKUP Fuse in the instrument panel I/P electrical center to the body control module (BCM).

The BCM applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is part of the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior lamp dimming switch through the I/P dimming return circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply voltage circuit and they dim to the correct level.

The IP lamps are located in the following components:
- Cigar lighter
- Driver Information Center DIC switch
- Door lock switches
- Fog Lamp switch
- Headlamp switch (turn signal multifunction switch)
- Hazard switch
- HVAC Control
- Rear HVAC Control if equipped
- I/P cluster
- Power window switch
- Power mirror switches
- PRNDL
- Radio
- Rear Seat Audio if equipped
- Steering Wheel Controls
- Sunroof switch
- Sunshade switch
- TCS switch
- Universal garage door opener switch

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The BCM receives a ground signal on the I/P lamps supply voltage circuit.

ACTION TAKEN WHEN THE DTC SETS
The I/P lamps are not illuminated

CONDITIONS FOR CLEARING THE DTC
The BCM clears this code from current when the fault is removed from the system.

CIRCUIT/SYSTEM VERIFICATION
Ignition ON, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The I/P lamps should dim and then become full bright.

CIRCUIT/SYSTEM TESTING
1. Clear the DTC. Headlamp switch OFF, disconnect all interior lamps dimming related components. Verify the DTC B2652 does not set
- If the DTC resets then test for a short to ground in the I/P lamps supply voltage circuit. If the circuit/connections test normal replace the BCM.
2. Reconnect each component one at a time and test for the DTC B2652.
- If the DTC resets, then replace that component.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Multifunction Turn Signal Switch Housing Replacement
- Hazard Warning Switch Replacement
- Instrument Panel Dimmer Switch Replacement
- Automatic Transmission Control Indicator Replacement
- Sunroof Switch Replacement
- Driver Information Display Switch Replacement
- Control Module References for BCM replacement, setup, and programming Verification Tests Programming and Relearning