1999 Buick Riviera Owner's Manual - Page 265

yellowblue The driver's side low-beam headlamp access area is behind and between the high-beam area and the air cleaner. 1. Loosen the two bolts on the inboard edge of the headlamp assembly. This allows you to pull out the assembly for more hand clearance when changing bulbs. 2. Reach into the assembly and turn the bulb socket one-quarter of a turn toward the center of the engine compartment, while pressing it firmly. 5. Turn the bulb socket one-quarter of a turn making sure the tab is properly engaged in the panel slot. 6. To reassemble, attach the wire connector (A) to the plastic base making sure the lock tab (B) is over the lock (C). 7. Replace the headlamp assembly and tighten the two bolts on the inboard edge of the assembly. Headlamp Aiming Your vehicle has a headlamp system equipped with horizontal and vertical aim indicators. The aim has been pre-set at the factory and should need no further adjustment. This is true even though your vertical and horizontal aim indicators may not fall exactly on the "0" (zero) marks on their scales. If your vehicle is damaged in an accident, the headlamp aim may be affected. Aim adjustment may be necessary if it is difficult to see lane markers (for horizontal aim), or if oncoming drivers flash their high beams at you (for vertical aim). If you believe your headlamps need to be re-aimed, we recommend that you take it to your dealer for service; however, it is possible for you to re-aim your headlamps as described in the following procedure. 3. Remove the wire connector from the bulb by lifting the lock tab (B) and pulling it away from the plastic base. 4. Install the bulb by putting the small tab (D) into the small notch in the lamp (E). 6-33