For 1990-2009 cars only
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 B257C 00: Left Headlamp AssemblyCircuit/System Description
On vehicles equipped with adaptive forward lighting, the headlamps can turn left and right to improve visibility during turns.
Conditions for Running the DTCs
| • | Ignition ON. |
| • | Gear selector in DRIVE. |
| • | Headlamp switch in AUTO position. |
| • | The ambient light sensor indicating Night. |
| • | Vehicle speed greater than 2 km/h (1.3 mph). |
| • | The steering wheel is turned greater than 10 degrees to the right or left. |
Condition for Setting the DTC
A malfunction in the adaptive forward lighting system.
Action Taken When the DTC Sets
The adaptive forward lighting system is inoperative for the remainder of the ignition cycle.
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify that DTC B257C is not set.
| ⇒ | If the DTC is set, replace the left headlamp control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for headlamp control module replacement, setup, and programming
