Headlamp Aiming Procedure (Mechanical Method)

Headlamp Aiming Procedure (Mechanical Method):

If a headlamp testing machine is used, it should give results equivalent to those obtained using the screen method. It should be in good repair and adjustment, and should be used in accordance with the manufacturer's instructions. The machine using a photoelectric cell or cells to determine aim should also have a visual screen upon which the beam pattern is projected proportional to its appearance and aim on a screen at 7.62 m (25 ft). Such a visual screen should be plainly visible to the operator and should have horizontal and vertical reference lines to permit visual appraisal of the lamp beam.

Horizontal and vertical aiming of each of the composite headlamps is done by turning adjusting screws which move the headlamp capsule in relation to the headlamp frame. The horizontal adjustment screw (1) is located on the inboard side of each of the headlamp assemblies, covered by a plug (2) on the headlamp bezel. The vertical adjustment screw (3) is located on the inboard side of each of the headlamp assemblies, below the lower edge of the headlamp bezel.

VEHICLE PREPARATION
Prepare the vehicle for checking the headlamp beam aim as follows:
^ Make sure that all the components are in place on the vehicle, if other service has been performed on the vehicle.
^ Make sure the fuel level is 1/2 full or less.
^ Be sure tires are inflated to the proper pressures.
^ Stop all other operations of work on the vehicle.
^ Close the doors.
^ Rock the vehicle sideways to stabilize the suspension.

ADJUSTMENT PROCEDURE
Tools Required
J 25300-E Headlamp Aimer

1. Raise the hood.
2. Raise the headlamps.

Headlamp Aiming Procedure Vehicle Preparation Adjustment Procedure:

3. Remove the headlamp adjustment screw plug from the headlamp bezel. Reach under the headlamp bezel and push out the plug from behind.

Headlamp Aiming Procedure Vehicle Preparation Adjustment Procedure:

IMPORTANT: Select aim-adjusting tools carefully since one full turn of an adjusting screw will move the aim approximately 89 mm (3.5 in) when measured at 7.62 m (25 ft).

4. Install J 25300-E, using the small pad pattern adapter J 25300-203 (included with J 25300-E) to the headlamp capsule lens.
5. Calibrate the mechanical aimers (conforming to SAE J1602) as follows:
5.1. Set the master fixture to "0" up/down and "0" right/left.
5.2. Calibrate the aimers on the master fixture to read "0" up/down and "0" right/left.
6. Inspect the horizontal and vertical aim and adjust as necessary.

Headlamp Aiming Procedure Vehicle Preparation Adjustment Procedure:

7. Install the headlamp adjustment screw plug. Push to secure.
8. Turn OFF the headlamps.
9. Lower the hood.