Circuit/System Description
When the Headlamp and Panel Dimmer Switch is placed in the headlamp ON position, ground is applied to the body control module (BCM) through
the headlamp low beam signal circuit. The BCM then applies ground to the HDLP LO/HID Relay control circuit which energizes the low beam
relay. With the low beam relay energized, the switch contacts close allowing B+ to flow through the LOW HDLP fuses to the low beam headlamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Headlamps must be ON.
Conditions for Setting the DTC
The BCM detects a short to voltage in the headlamp low beam relay control circuit.
Actions Taken When the DTC Sets
The low beam headlamps will not operate.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
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)
Description and Operation
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description
and Operation)
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)
