1993 Pontiac Grand Prix Owner's Manual - Page 238

Halogen Bulbs Halogen bulbshave L b pressurizedgasinside and can burst if you drop or scratch the bulb. You or others could be injured. Take special care when handling and disposing of halogen bulbs. Checking Aim of the Headlights @-DOOR MODELS) Your vehicle has the 55 x 135 miniquad headlight system. These headlights havehorizontal and vertical aim indicators. The aim has been preset at thefactory and should need no further adjustment. To check the aim, the vehicle should be properly preparedas follows: The vehicle must have allfour tires on a perfectly level surface. The vehicle should not have any snow, ice or mud attached to it. There should not be any cargo or loading of vehicle, except it should have a fulltank of gas and oneperson or 160 pounds (75 kg) on the driver's seat. Tires should be properly inflated. The horizontal indicator (A) should read 0 (zero).