Backup Lamps

WARNING: This page is about a different variant/trim than selected.

The backup (or reverse) lamps have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal. On vehicles with a manual transmission, when REVERSE is selected, the backup lamp switch provides a hard wired input to the Electric Vehicle Control Unit (EVCU) through a reverse switch signal circuit. The EVCU then sends an electronic reverse transmission gear selector status message to the Body Control Module (BCM) over the Controller Area Network (CAN) data bus. The BCM energizes a high side driver which provides battery voltage to the backup lamps on the backup lamp feed circuit whenever the ignition switch is in the ON position and the REVERSE position is selected with the transmission shift linkage.

On vehicles with an automatic transmission, the Transmission Control Module (TCM) monitors a multiplex input from the Transmission Range Sensor (TRS). When REVERSE is selected, the TCM sends an electronic reverse transmission gear selector status message to other electronic modules over the CAN data bus. Whenever the ignition switch is in the ON position and the BCM receives an electronic message indicating the status of the transmission gear selector is REVERSE, the BCM energizes a high side driver, which provides battery voltage to the backup lamps on the backup lamp feed circuit.