2010 Hummer H3 Owner's Manual - Page 299

Vehicle Care 10-33 Headlamp Aiming The vehicle may have a visual optical headlamp aiming system. The aim has been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a crash, the headlamp aim may be affected and adjustment may be necessary. If oncoming vehicles flash their high beams at you, this may also mean the vertical aim needs to be adjusted. It is recommended that the vehicle is taken to your dealer for service if the headlamps need to be re-aimed. It is possible however, to re-aim the headlamps as described. The vehicle should be: . To adjust the vertical aim: 1. Open the hood. See Hood on page 10‑5. Placed so the headlamps are 7.6 m (25 ft) from a light colored wall or other flat surface. On a level surface which is level all the way to a wall. Placed so it is at a right angle to the wall or other flat surface. Clear of any snow, ice, or mud on it. Fully assembled, the tires properly inflated, and all other work stopped while headlamp aiming is being performed. Normally loaded with the spare tire in its original location and a full tank of fuel and one person or 75 kg (160 lbs) sitting on the driver seat. . . . . . 2. Record the distance from the ground to the aim dot on the headlamp.