2010 Cadillac Truck SRX FWD V6-3.0L Page 720

2010 Cadillac Truck SRX FWD V6-3.0L 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