Headlamp Aiming By Screen Method

Visual Headlamp Aim Adjustment & Inspection:

Visual Headlamp Aim Adjustment & Inspection Limits:

Headlamp Aiming by the Screen Method

First locate the vehicle so that it is square with the screen and with the front of the headlamps directly over a reference line which has been painted on the floor. Next locate the center line on the aiming screen so that it is in line with the center of the vehicle. This can be done by sighting through the center of the rear window of the vehicle and over the hood ornament. Have vehicle moved until it is in alignment with these two points. If there is no center hood ornament, mark the center of the front and rear windows with narrow strips of masking tape. Use these sights to locate the center line of the aiming screen directly in line with the vehicle axis.

Aiming Area Required

It is desirable to have a specific aiming area in a darkened location. This should be sufficient for the vehicle and an additional 7.6 m (25 feet) measured from face of lamps to the front of the visual screen.

The floor on which the vehicle rests must be flat, and level with the bottom of the screen. If the floor is not level, compensate.

Aiming Screen

If a screen is used, it should be 1.5 m (5 feet) high x 3.6 m (12 feet) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. Provisions may be made for moving the screen so it can be aligned parallel with the rear axle and so a horizontal line drawn perpendicularly from the centerline of the screen will pass an equal distance midway between the two headlamps. The screen shall be provided with a fixed vertical centerline, two laterally adjustable vertical tapes, and one vertically adjustable horizontal tape. If regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.8 m (6 feet) high and 3.6 m (12 feet) wide. The surface should be finished with a washable non-gloss white paint. After the aiming screen has been set up in its permanent location, it is necessary paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed.

Important
^ Aim composite headlamps on LOW BEAM only.

Low Beam Type 9006 (HB4)

Preparation:

^ Tires should be properly inflated.
^ All four tires should be on a perfectly level surface.
^ There should not be any snow, ice or mud attached to vehicle.
^ There should not be any cargo or loading of vehicle.
^ The vehicle should have a full tank of gas.
^ The vehicle should contain one person or 75 kg (165 pounds) on driver's seat.

Equipment: Marked screen and adequate test area.

Procedure: With vehicle properly located and loaded, switch headlamps to low beam and observe left and top edges of high intensity zone on the screen.

Headlamp Not Within Specifications: If left edge is horizontally more than:

^ 102 mm (4 inches) LEFT or
^ 102 mm (4 inches) RIGHT of straight ahead

Headlamp Not Within Specifications: If top edge is vertically more than:

^ 51 mm (2 inches) ABOVE or
^ 51 mm (2 inches) BELOW the horizontal line.

High Beam (H4352)

Preparation:

^ Tires should be properly inflated.
^ All four tires should be on a perfectly level surface.
^ There should not be any snow, ice or mud attached to vehicle.
^ There should not be any cargo or loading of vehicle.
^ The vehicle should have a full tank of gas.
^ The vehicle should contain one person or 75 kg (165 pounds) on driver's seat.

Equipment: Marked screen and adequate test area.

Procedure: With vehicle properly located and loaded, switch headlamps to low beam and observe left and top edges of high intensity zone on the screen.

Headlamp Not Within Specifications: If center is horizontally:

^ More than 102 mm (4 inches) RIGHT or
^ More than 102 mm (4 inches) LEFT of straight ahead

Headlamp Not Within Specifications: If center is vertically:

^ More than 102 mm (4 inches) ABOVE or
^ More than 102 mm (4 inches) BELOW the horizontal line.