2010 Cadillac Truck SRX AWD V6-3.0L Page 355

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2010 Cadillac Truck SRX AWD V6-3.0L Page 355



DTC B388A 02



- Trailer Park Lamps Circuit Short to Ground



DTC B388A 04



- Trailer Park Lamps Circuit Open



Diagnostic Fault Information



Circuit/System Description



The trailer park lamp relay is supplied with battery voltage at all times. The trailer park lamp signal circuit is grounded by turning the headlamp



switch. The body control module (BCM) energizes the trailer park lamp relay by applying ground to the trailer park lamp relay control circuit.



When the trailer park lamp relay is energized, the relay switch contacts close and battery voltage is applied through the trailer park lamp relay fuse



to the trailer park lamp supply voltage circuit which illuminates the trailer park lamps if a trailer is connected.



Conditions for Running the DTC



When the trailer park lamp relay is actively being requested by the BCM.



Conditions for Setting the DTC



B388A 01



The BCM detects a short to voltage on the park lamp supply voltage/marker lamp supply voltage circuit.



B388A 02



The BCM detects a short to ground on the park lamp supply voltage/marker lamp supply voltage circuit



B388A 04



The BCM detects an open/high resistance on the park lamp supply voltage/marker lamp supply voltage circuit



Action Taken When the DTC Sets



B388A 01 or B388A 04



The trailer park lamps are inoperative



B388A 02



The trailer park lamps are always ON



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 40 ignition cycles.



Reference Information



Schematic Reference



Trailer Connector/Provision Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System



Diagram/Trailer Connector/Provision 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

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