Thursday, February 13, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 720

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 720



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



Control Module References (See: Testing and Inspection/Programming and Relearning) for trailer brake control module replacement,



programming and setup



With U4G



DTC B3887 or B3888 (With U4G)



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 B3887 02



- Trailer Left Turn Signal Circuit Short to Ground



DTC B3887 04



- Trailer Left Turn Signal Circuit Open



DTC B3888 02



- Trailer Right Turn Signal Circuit Short to Ground



DTC B3888 04



- Trailer Right Turn Signal Circuit Open



Diagnostic Fault Information



Circuit/System Description



The trailer brake control module will receive a serial data message from the BCM indicating that the vehicle left turn signal lamp or the right turn



signal lamp has been activated. The trailer brake control module will then apply a pulsating voltage to the appropriate trailer turn signal lamps



through their respective voltage supply circuits.



Conditions for Running the DTC



When the trailer left turn lamp or right turn lamp is being actively commanded by the trailer brake control module.



Conditions for Setting the DTC



B3887 02 or B3888 02



The trailer brake control module detects a short to ground on the appropriate turn signal control circuit.



B3887 04 or B3888 04



The trailer brake control module detects an open/ high resistance in the appropriate turn signal control circuit.



Action Taken When the DTC Sets



The appropriate trailer turn signal lamp will be inoperative.



Conditions for Clearing the DTC

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