2002 Oldsmobile Alero Owner's Manual - Page 272

Headlamp Aiming 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. To check the aim, the vehicle should be properly prepared as follows: 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. 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. 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. 6-35