Headlamp Aiming Using the Screen Method: Location
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
The area should be darkened and large enough for the vehicle and an additional 7.62 m (25 ft) measured from the face of the headlamps to the front of the screen. The floor on which the vehicle rests must be parallel with the bottom of the screen. Compensate for an uneven floor, if necessary.