1999 Buick Riviera Owner's Manual - Page 269

yellowblue 3. Pull the taillamp assembly away from the vehicle carefully, to avoid scratching the paint. The taillamp has safety straps to help you hold the assembly while replacing the bulbs. The following instructions explain how to change each bulb. 1. Remove the bulb socket assembly by squeezing the plastic lock and turning it one-quarter of a turn counterclockwise. 6-37