Checking the Headlight Aim
p3 dm 23.02.001
- Park the vehicle on a level surface, 25 ft (7.6 m) away from, and perpendicular to, a vertical screen or wall. Shut down the engine and set the parking brake. Chock the tires.
- Each headlight has a height adjusting dot. See Fig.. Measure the distance
from the ground to the height adjusting dot on each headlight. Note
those distances. See Fig.,
ref. A.
Note: Measure beam height from the ground to the small dot roughly in the center of the headlight lens.
Fig. 1, Headlight Beam Height Adjusting Dot
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Measure the distance from the ground to the center of each headlight bulb.
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Mark where the center of each headlight projection should appear.
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Screen or Wall
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Center of Right-Hand Headlight Projection
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Center of Left-Hand Headlight Projection
Fig. 2, Headlight Aiming Screen/Wall
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- Mark the vertical distances found in step 2 on the screen or wall, directly in front of the headlights. These marks represent the desired locations of each headlight bulb center in the following steps. See Fig., items 2 and 3.
- Turn on the low-beam headlights.
- Check the vertical adjustment of the low beams. The center
of each beam projection should fall on or near the marks made during
step 3. See .
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Low-Beam Angle Upper Limit
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Ideal Low-Beam Projection
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Low-Beam Angle Lower Limit
Fig. 3, Vertical Low-Beam Headlight Variation Limits
-
- Use Table. to
determine the maximum vertical distance allowable between the marks
on the wall and the center of each low-beam projection.If the distance between either projection center and the mark made on the wall or screen is greater than the maximum distance given in see , adjust the vertical positioning of that headlight.
Table 1, Vertical Low-Beam Headlight Variation Limits
Vertical Low-Beam Headlight Variation Limits
Distance Between Ground and Headlight: in (mm)
22–36 (560–900)
0
3.9 (100)
3.9 (100)
36–48 (900–1200)
2 (50) down
2 (50)
6 (150)
48–54 (1200–1400)
4 (101.6) down
1.6 (40)
6.5 (165)
Table 1, Vertical Low-Beam Headlight Variation Limits
Note: