2011 Chevrolet Tahoe Owner's Manual - Page 420

10-36 Vehicle Care The vehicle should: . Headlamp Aiming The vehicle has a visual optical headlamp aiming system. The aim of the headlamps has been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a crash, the aim of the headlamps may be affected and adjustment may be necessary. If oncoming vehicles flash their high beams at you, this may mean the vertical aim of the headlamps needs to be adjusted. It is recommended that the vehicle be taken to your dealer for service if the headlamps need to be adjusted. It is possible, however, to re-aim the headlamps as described. Be placed so the headlamps are 7.6 m (25 ft) from a light‐colored wall. Have all four tires on a level surface which is level all the way to the wall. Be placed so it is perpendicular to the wall. Not have any snow, ice, or mud on it. Be fully assembled and all other work stopped while headlamp aiming is being performed. Be loaded with a full tank of fuel and one person or 75 kg (160 lbs) sitting on the driver seat. Have the tires properly inflated. Have the spare tire in its proper location in the vehicle. . Headlamp aiming is done with the vehicle's low-beam headlamps. The high-beam headlamps will be correctly aimed if the low-beam headlamps are aimed properly. To adjust the vertical aim: 1. Open the hood. See Hood on page 10‑5 . . . . . . 2. Locate the aim dot on the lens of the low‐beam headlamp. 3. Record the distance from the ground to the aim dot on the low‐beam headlamp.