1999 Buick Riviera Owner's Manual - Page 267

yellowblue Taillamps/Rear Turn Signal/Back-Up Lamps 2. Turn the vertical aiming screw (C) until the level bubble (D) is lined up with zero. Front Turn Signal Lamps The turn signal bulb is located in the front fascia. 1. Remove the panel on the underside of the bulb assembly by pulling the two fasteners that hold it in place. 2. Reach in to press the locking tab and twist the bulb socket one-quarter of a turn counterclockwise and pull the bulb out of the socket. 3. Replace the bulb, then reassemble by reversing Steps 1 and 2. Taillamps: A, B and C Rear Turn Signal: A and C Back-Up Lamps: D The entire taillamp assembly must be removed to change any of these bulbs. 6-35