Aiming Area Preparation

Choose an appropriate aiming area, then prepare the aiming screen:

Fig 1: View Of Aiming Area
Courtesy of GENERAL MOTORS CORP.
• The aiming area should be darkened and large enough to accommodate the vehicle and an additional 7.62 m (25 ft) measured from the face of the headlamp capsules to the front of the screen.
• The floor on which the vehicle rests must be flat with the bottom of the screen.
• The aiming screen 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. The screen should be provided with a vertical centerline (3), 2 laterally adjustable vertical tapes (2), and one vertically adjustable horizontal tape (1).
IMPORTANT: Adjust the horizontal line or tape (1) on the screen. for each vehicle tested. Vehicles of the same model and year may have different standing height for the headlamp.
• The screen must be movable to be aligned parallel with the rear axle of the vehicle. This will allow for a horizontal line drawn perpendicular to the centerline of the screen to pass through the center point between the 2 headlamp capsules (4).
• After the aiming screen has been set up in a permanent location, paint or tape a reference line on the floor 7.62 m (25 ft) from the screen, to identify the proper location of the headlamp capsules (5) being aimed.

  If a regular commercial aiming screen is not available, use a vertical wall having a clear uninterrupted area at least 1.83 m (6 ft) high by 3.66 m (12 ft) wide, finished with a washable non-gloss white paint.