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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 173 (Lighting Systems) >> Description and Operation >> Exterior Lighting Systems Description and Operation >> Backup Lamps

Backup Lamps

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

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.

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