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 Descriptor
DTC B0951 00: Headlamps On Indicator CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
LED Dimming Control | B0591, B2625 | B0591 | -- | -- |
Headlamp On Indicator Control | -- | 1 | 1 | -- |
1. Headlamp on indicator inoperative | ||||
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. |
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
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
- Ignition OFF, disconnect the headlamp switch connector X1.
- Connect a test lamp between the LED dimming control circuit terminal K and ground.
- Park lamps ON, operate the IP dimmer switch between bright and dim. The test lamp should illuminate bright to dim.
- If all circuits test normal, replace the headlamp switch.
| ⇒ | If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the BCM. |
| ⇒ | If the test lamp remains illuminated bright, test the control circuit for a short to voltage. If all circuits test normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, programming, and setup
