2010 Cadillac Truck SRX AWD V6-3.0L Page 743

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2010 Cadillac Truck SRX AWD V6-3.0L Page 743



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B3948 02



- Left Front Turn Signal Circuit Short to Ground



DTC B3949 02



- Right Front Turn Signal Circuit Short to Ground



Diagnostic Fault Information



Circuit/System Description



Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the



ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is



applied to the body control module through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to



the front and rear turn signal lamps through there respective voltage supply circuits. When a turn signal request is received by the BCM, a serial



data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.



Conditions for Running the DTC



When the appropriate turn signal is commanded



Conditions for Setting the DTC



B3948 02



The BCM detects a short to ground on the left front turn signal control circuit.



B3949 02



The BCM detects a short to ground on the right front turn signal control circuit.



Action Taken When the DTC Sets



The appropriate turn signal lamp 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



Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)



Connector End View Reference

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