Backup Lamps (Century)
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The backup lamps are located in the rear compartment lid applique. The backup lamps operate when the ignition switch is in the RUN position and the transaxle range selector lever is in REVERSE.
The R/CMPT REL fuse supplies battery voltage at all the times to the park/neutral position switch. When the park/neutral position switch is place in REVERSE battery voltage is applied to the backup lamps illuminating the lamps. The backup lamps receive a constant ground signal