B2545

DTC B2545

Diagnostic Instructions

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

Circuit/System Verification

Ignition ON, activate the Backup Lamps output control on the scan tool. The Backup Lamps parameter in the data list 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 back up lamp voltage supply circuit terminal listed below and B+:

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

^ If the test lamp illuminates, test the voltage supply circuit for a short to ground.

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

Repair Instructions

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