Backup Lamp: Description and Operation
BACKUP LAMPSWith the ignition switch in the ON position and the driver selects the REVERSE position, the automatic transmission range switch will illuminate the backup lamps.
When the ignition switch is in the ON position, battery voltage is supplied to fuse #3. Fuse #3 supplies battery voltage to the automatic transmission range switch. When the automatic transmission control lever is moved to the REVERSE position, battery voltage is supplied to the LH and RH backup lamps through the automatic transmission range switch. The backup lamps are permanently grounded to G400.