Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Backup Lamps Relay B+ | 1 | 1 | -- | -- |
Backup Lamps Relay Control | B2545 00 | 1 | 1 | -- |
Backup Lamps Control | 1 | 1 | 1 | -- |
Backup Lamps Ground | -- | 1 | -- | -- |
Backup Lamps Relay Ground | -- | 1 | -- | -- |
1. Backup Lamps Malfunction | ||||
Circuit/System Description
When the transmission range selector 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 relay control circuit energizing the backup lamps PCB relay. With the relay energized, battery voltage is applied through the left and right backup lamp fuses and the supply voltage circuits to the backup lamps.
Conditions for Running the DTC
Ignition ON. The backup lamps must be commanded ON.
Conditions for Setting the DTC
The BCM detects a short to ground on the backup lamps relay control circuit.
Action Taken When the DTC Sets
The BCM will deactivate the backup lamps for the remainder of the ignition cycle.
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, place the transmission range selector in the REVERSE position. The backup lamps should illuminate.
Circuit/System Testing
- Ignition OFF, disconnect the X1 harness connector at the body fuse block.
- Connect a test lamp between the control circuit terminal 57 and ground.
- Ignition ON, command the backup lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, replace the body fuse block.
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
