The screen method is preferred for aiming
headlamps. If the headlamp is equipped with aiming pads, headlamp aiming may
be performed using the alternate procedure.
Headlamp aiming is done with the vehicle's low beam lamps. The high
beam lamps will be correctly aimed if the low beam lamps are aimed properly.
If the high beam needs adjustment, follow the screen method using the high
beam bulb as the reference for measurements.
Screen Method for Headlamp Aiming (Visual Aim)
The screen method requires an area set up specifically
for headlamp aim.
The area should consist of a level surface large enough to allow for
a vehicle and an additional 7.62 m (25 ft) as measured from
the face of the headlamps to the aiming screen.
The screen should be a wall or other flat surface 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 90 degrees to the floor.
The screen should be provided with a permanent vertical reference line 2 feet
from the left edge of the screen, 2 laterally adjustable vertical tapes,
and one vertically adjustable horizontal tape.
After the aiming screen has been set up and located, paint or tape a
reference line on the floor 15.24 m (50 ft) from the vertical
reference line on the screen. This line should be perpendicular to the aiming
screen and a mark placed at 7.62 m (25 ft) from the screen.
Headlamp Aiming Procedure
- Align the left tires of the vehicle with the reference line extending
from the screen with the headlamps aligned with the reference line.
- Remove any snow, ice or mud from the vehicle.
- The vehicle should be fully assembled and all other work stopped
while the headlamp aiming is being done.
- The vehicle should contain cargo or be loaded to represent normal
vehicle use.
- Tires should be properly inflated.
- Rock the vehicle to stabilize the suspension.
- Measure from the floor to the center of the lamp bulb on the vehicle.
Some lamps have an aim dot marked on the lens.
- At the screen, measure from the floor and place the horizontal
tape at the measured distance.
- Measure from the reference
line on the floor to the left headlamp bulb centerline.
- At the screen, measure from the reference line and place the vertical
tape at the measured distance.
- Measure from the reference line on the floor to the right headlamp
bulb centerline.
- At the screen, measure from the reference line and place the vertical
tape at the measured distance.
- Turn on the headlamps.
- Adjust the headlamps to the specifications required by state and
local authorities.
- This illustration represents
the visual optics left (VOL) pattern.
- This illustration represents
the visual optics right (VOR) pattern.
- This illustration represents
all headlamps, except the VOL and VOR.
- This illustration represents
the high beam pattern for all headlamps, including VOL and VOR.
Alternate Aiming Procedure
Tool Required
J 25300-D Headlamp
Aimer-Mechanical
This procedure may only be used on headlamps equipped with aiming pads.
Adjustment settings are embossed on the headlamp lens. They are typically
located near the aiming pads. In some cases, the adjustment settings are
located in other areas of the lens. They will be represented by a number
followed by the letter V or the letter H.
- Remove any snow, ice or mud from the vehicle.
- The vehicle should be fully assembled and all other work stopped
while the headlamp aiming is being done.
- The vehicle should contain cargo or be loaded to represent normal
vehicle use.
- Tires should be properly inflated.
- Rock the vehicle to stabilize the suspension.
- Using the , adjust the headlamps to the specifications required
by state and local authorities.