Backup Lamp: Description and Operation

BACKUP LAMPS

The CHMSL BACKUP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM). When the driver places the gear selection into the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the BCM. The message indicates that the gear selector lever is in the REVERSE position. The BCM then applies voltage to the backup lamp supply voltage circuit. Ground for the left backup lamps is from G401 and for the right backup lamp is from G400.