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 Voltage Supply | B2545 00 | 1 | 2 | -- |
| ||||
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 lamp ground located in the inside rearview mirror. The Back up lamps are also directly grounded through G401.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The backup lamps must be commanded ON. |
Conditions for Setting the DTC
The BCM detects a short to ground on the backup lamp control circuit when the backup lamps are being commanded ON.
Action Taken When the DTC Sets
The backup 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. |
| • | The BCM receives the clear code command from the scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
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
- Ignition OFF, disconnect the instrument panel (I/P) fuse block connector X1 34, inside rearview mirror.
- Ignition OFF, disconnect the BCM harness connector X6 and test for a ground signal at the connector terminal 2.
- Reconnect the inside rearview mirror and test the BCM harness connector X1, terminal 34 again for ground.
- Reconnect the I/P fuse block connector and test the BCM harness connector X1, terminal 34 again for ground.
| ⇒ | If the circuit exhibits a ground signal, repair the short to ground in the control circuit. |
| ⇒ | If the circuit now exhibits a ground signal of 20 ohms or less, replace the inside rearview mirror. |
| ⇒ | If the circuit now exhibits a ground signal of 20 ohms or less, replace the I/P fuse block. |
| ⇒ | If the circuit does not exhibit a ground, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM, inside rearview mirror, and rearview camera module replacement, setup, and programming |
