Backup Lamp: Description and Operation

The underhood fuse/relay center provides battery positive voltage to both the REVERSE relay coil and switch through the PARK/REV fuse. When the gear selector is placed in the REVERSE position, the Powertrain Control Module (PCM) sends a Class 2 message to the BCM. In response to this message, the BCM grounds the REVERSE relay coil, energizing the relay. The relay switch contacts close and battery positive voltage is supplied to the backup lamps. The backup lamps are permanently grounded at G402. The BCM will turn off the backup lamps if the ignition switch is turned to the OFF position or when the gear selector is moved out of the REVERSE position.