B0951

DTC B0951

Diagnostic Instructions

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

DTC Descriptor

DTC B0951
- Headlamps On Indicator Circuit

Diagnostic Fault Information






Circuit/System Description

The body control module (BCM) controls the illumination dimming of all of the control switch indicators. The BCM will set the control switch indicator illumination level according to the instrument panel (I/P) dimmer switch signal received when the component is activated and the indicator is ON.

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The LED dimming control circuit is open or shorted to ground.

Action Taken When the DTC Sets

The control switch indicators will not operate or will not dim.

Conditions for Clearing the DTC

* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.

Circuit/System Verification

1. Ignition ON, operate the headlamp switch on and off. The headlamp on indicator should turn on and off.
2. Headlamps ON, operate the interior dimming switch between bright and dim. The headlamp on indicator should change from bright to dim.

Circuit/System Testing

1. Ignition OFF, disconnect the headlamp switch connector X1.
2. Connect a test lamp between the LED dimming control circuit terminal K and ground.
3. Park lamps ON, operate the IP dimmer switch between bright and dim. The test lamp should illuminate bright to dim.

^ If the test lamp does not illuminate, test the control circuit for an open/high resistance or short to ground.

^ If the test lamp remains illuminated bright, test the control circuit for a short to voltage.

4. If all circuits test normal replace the BCM.

Repair Instructions

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