2010 Cadillac Truck SRX FWD V6-3.0L Page 727

2010 Cadillac Truck SRX FWD V6-3.0L Page 727

3. If all the circuits test normal, replace the K9 BCM.

Repair Instructions

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

* Fuse Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and Repair/Removal and Replacement/Fuse

Block Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, programming and setup

B3889

DTC B3889

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 B3889 02

- Trailer Brake Lamps Circuit Short to Ground

DTC B3889 04

- Trailer Brake Lamps 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 brake lamps have been activated. The

trailer brake control module will then apply system voltage to the trailer stop lamps through their respective voltage supply circuits.

Conditions for Running the DTC

When the brake pedal is pressed.

Conditions for Setting the DTC

B3889 02

The trailer brake control module detects a short to ground on the trailer stop lamp control circuit.

B3889 04

The trailer brake control module detects an open/ high resistance on the trailer stop lamp control circuit.

Action Taken When the DTC Sets

The trailer brake lamps will be 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 40 ignition cycles.