Headlamp Adjustment

Headlamp Adjustment

WARNING: Before beginning any service procedure, REFER to Safety Warnings . Failure to follow this instruction may result in serious personal injury.

General Procedure

NOTE: For the photometric aiming procedure, refer to the appropriate photometric headlamp aimer instruction manual.

NOTE: This procedure should be done in a dark environment to effectively see the headlamp beam pattern.

NOTE: Horizontal aim is not adjustable.

NOTE: Consult your state vehicle inspection manual for recommended tolerance ranges for visual aiming.

NOTE: The radiator sight shield may need to be positioned or removed for access to the adjusters. Refer to Owner Information for specific adjuster locations.

1. Before starting headlamp adjustment:

1. check that the vehicle is on level ground.

2. check the tire inflation.

3. check that no other load is in the vehicle other than a half tank of fuel.

4. check that the headlamps are clean.

5. check for correct headlamp operation.

6. if the vehicle is equipped with air suspension, make sure that the switch is on.

2. NOTE: The vertical wall or screen must be a minimum of 2.44 m (8 ft) wide

Park the vehicle on a level surface approximately 7.62 m (25 ft) from the vertical wall or screen directly in front of it.







3. NOTE: The center of the lamp is marked either on the lens (circle, crosshair or other mark) or on the bulb shield internal to the lamp (crosshair or other mark).

Mark a horizontal reference line on the vertical wall or screen.





1. Measure the center of the headlamp height to ground and record the measurement.

2. Make a 2.44 m (8 ft) horizontal mark (using masking tape) on the vertical wall or screen at the same distance from the ground as previously recorded.

4. Turn the low beam headlamps on to illuminate the wall or screen and open the hood.

5. On the wall or screen, locate the high intensity area of the beam pattern.

6. NOTE: The appearance of the VOR beam pattern may vary between vehicles.

For VOR-type headlamps, identify at the top edge of this high intensity area a distinct horizontal cutoff in the beam pattern. If the top edge of this cutoff is not even with the horizontal reference line, the headlamp beam needs to be adjusted using the headlamp adjusting screw.







7. For VOL-type headlamps, there is a distinct cutoff in the left portion of the beam pattern. The edge of this cutoff should be positioned 50.8 mm (2 in) below the horizontal reference line. Adjust the headlamp as necessary using the headlamp adjusting screw.





1. Horizontal reference line.

2. Top edge of the beam pattern.

3. High intensity zone.