1999 Buick Riviera Owner's Manual - Page 266

yellowblue The headlamp aiming devices are under the hood near the headlamps. Start with the horizontal aim. The adjustment screws can be turned with an E8 TorxR socket or T15 screwdriver. Once the horizontal aim is adjusted, then adjust the vertical aim. NOTICE: To make sure your headlamps are aimed properly, read all the instructions before beginning. Failure to follow these instructions could cause damage to headlamp parts. The vehicle should be properly prepared as follows: D The vehicle must have all four tires on a perfectly level surface. D If necessary, pads may be used on an uneven surface. D The vehicle should not have any snow, ice or mud attached to it. D The vehicle should be fully assembled and all other D There should not be any cargo or loading of the D Close all doors. D Tires should be properly inflated. D Rock the vehicle to stabilize the suspension. 6-34 work stopped while headlamp aiming is being done. vehicle, except it should have a full tank of fuel and one person or 160 lbs. (75 kg) on the driver's seat. 1. Turn the horizontal aiming screw (A) until the indicator (B) is lined up with zero.