2010 Cadillac Truck SRX AWD V6-3.0L Page 295
DTC Descriptors
DTC B257C 00
- Left Headlamp Assembly Malfunction
DTC B257D 00
- Right Headlamp Assembly Malfunction
Diagnostic Fault Information
Circuit/System Description
The headlamp control module calculates the headlamp angle and sends commands to the left and right adaptive forward lighting system headlamp
actuators. The headlamp actuators drive the headlamps to the position commanded by the headlamp control module. The headlamp control module
monitors the headlamp actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected,
a DTC will be stored in memory and the driver will be notified with a message displayed over the driver information center located on the
instrument cluster.
Conditions for Running the DTC
The headlamps are turned ON.
Conditions for Setting the DTC
B257C 00
The headlamp control module detects a fault in the left low beam control circuit or an open/high resistance is the left low beam ground circuit.
B257D 00
The headlamp control module detects a fault in the right low beam control circuit or an open/high resistance is the right low beam ground circuit.
Action Taken When the DTC Sets
The appropriate headlamp is inoperative.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System
Diagram/Headlights/Daytime Running Lights (DRL) Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
