Area Preparation

WARNING: This page is about a different car, the 2002 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.

The aiming area should be darkened and large enough to accommodate the vehicle and an additional 7.62 m (25 ft) measured from the headlamp aim dots to the screen or wall.
The floor on which the vehicle rests must be square with the front of the screen or wall. If the floor is not level, compensate as necessary.
If you are using an aiming screen, it should be at least 1.52 m (5 ft) high by 3.66 m (12 ft) wide with a matte white surface well-shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands.
If you are using a wall, it should be at least 1.83 m (6 ft) high by 3.66 m (12 ft) wide, finished with a washable non gloss white paint.