2010 Cadillac Truck SRX AWD V6-3.0L Page 307
The headlamp switch is supplied with ground at all times. When the headlamp switch is placed in either the park or low beam position, ground is
applied to the tail lamp signal circuit to the body control module (BCM). The BCM responds by applying battery voltage to the left/right park
lamps, left/right side marker lamps and left/right tail lamps. This energizes the appropriate lamp.
Conditions for Running the DTC
* The engine is running.
* Headlamp switch in AUTO position.
* The ambient light is day.
Conditions for Setting the DTC
B260B 01 or B260C 01
The BCM detects a short to voltage on the daytime running lamp relay control circuit.
B260B 02 or B260C 02
The BCM detects a short to ground on the daytime running lamp relay control circuit.
B260B 04 or B260C 04
The BCM detects an open/high resistance on the daytime running lamp relay control circuit.
Action Taken When the DTC Sets
B260B 01 or B260C 01
The appropriate daytime running lamp will be continuously illuminated.
B260B 02, B260C 04, B260B 02 or B260C 04
The appropriate daytime running lamp will be 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
Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights 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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)
Circuit/System Verification
Ignition ON, command the Left Dedicated Daytime Running Lamp and the Right Dedicated Daytime Running Lamp ON and OFF with a scan tool.
The E4C daytime running lamp - left and the E4D daytime running lamp - right should turn ON and OFF while changing between the commanded
