B2545

DTC B2545

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC B2545 00
- Backup Lamps Circuit

Diagnostic Fault Information





Circuit/System Description

When the PRNDL is placed in the REVERSE position, a signal is sent to the body control module (BCM). The BCM then applies voltage through the backup lamps control circuit to the back up lamps. The back up lamps are grounded through G401.

Conditions for Running the DTC

* The ignition is ON.
* The back up lamps must be commanded ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the back up lamp control circuit when the back up lamps are being commanded ON.

Action Taken When the DTC Sets

The back up lamps do not illuminate.

Conditions for Clearing the DTC

* The conditions for setting the DTC are no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Exterior Lights Schematics (Exterior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, command the Backup Lamps ON with a scan tool. The Backup Lamps parameter should display On and the backup lamps should illuminate.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the left back up lamp.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal listed below and B+:

* RPO WDA - terminal 1
* RPO Z88 - terminal 2
* RPO W49 - terminal A

• If the test lamp illuminates, test the control circuit for a short to ground.

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

Repair Instructions

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

Control Module References (Programming and Relearning) for BCM replacement, setup, and programming