2010 Cadillac Truck SRX FWD V6-3.0L Page 726

2010 Cadillac Truck SRX FWD V6-3.0L Page 726

When the appropriate turn signals are activated, the BCM will apply a pulsating ground to the appropriate trailer stop/turn signal lamp relay.

Conditions for Running the DTC

The system voltage is 9-16 V.

Conditions for Setting the DTC

B3887 02 or B3888 02

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

B3887 04 or B3888 04

The BCM detects an open/high resistance on the appropriate trailer turn signal control circuit

Action Taken When the DTC Sets

The appropriate trailer turn signal lamp 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.

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

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the function of the left trailer turn signal lamp and the right trailer turn signal lamp while commanding the Left Trailer Turn

Signal Lamp and the Right Trailer Turn Signal Lamp ON and OFF with a scan tool. The left trailer turn signal lamp and the right trailer turn signal

lamp should turn ON and OFF while changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.

2. Ignition ON, test for greater than 10 V between the control circuit terminal listed below and ground:

* Right trailer turn signal lamp control terminal 17

* Left trailer turn signal lamp control terminal 8

瀚慖f less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the X50 A fuse block-underhood.