2004 Buick LeSabre Owner's Manual - Page 286

If your vehicle is damaged in an accident, the headlamp aim may be affected. Aim adjustment to the low beam 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 your vehicle to your dealer for service. However, it is possible for you to re-aim your headlamps as described in the following procedure. 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: • The vehicle should be placed so it is perpendicular to the wall or other flat surface. • The vehicle should not have any snow, ice or mud attached to it. • The vehicle should be fully assembled and all other work stopped while headlamp aiming is being done. • The vehicle should be normally loaded with a full tank of fuel and one person or 160 lbs (75 kg) on the driver's seat. • Tires should be properly inflated. Headlamp aiming is done with the vehicle low-beam lamps. The high-beam lamps will be correctly aimed if the low-beam lamps are aimed properly. • The vehicle should be placed so the headlamps are 25 ft (7.6 m) from a light colored wall or other flat surface. • The vehicle must have all four tires on a perfectly level surface which is level all the way to the wall or other flat surface. 5-48