Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
B2545:01 Backup Lamps Circuit Short to Battery
B2545:02 Backup Lamps Circuit Short to Ground
B2545:02 Backup Lamps Circuit Open
To diagnose the B2545 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The backup lamp relay is always supplied with battery voltage. With the engine running and the transmission in the reverse position, the Transmission Control Module (TCM) sends a serial data message to the Body Control Module (BCM). The message indicates that the gear selector is in the reverse position. The BCM energizes the backup lamp relay by applying battery voltage to the backup lamp relay control circuit. When the backup lamp relay is energized, the relay switch contacts close, and battery voltage is applied through the backup lamp fuses to the backup lamp control circuits which illuminate the backup lamps. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove the battery voltage from the backup lamp relay control circuit. The engine must be running for the backup lamps to operate. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem with the backup lamps relay control circuit.
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