Checking the Aim of the Headlights
- 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 on the lens as
shown, see Fig.. Measure the distance from the ground to the height adjusting dot
on each headlight as shown see Fig.,
ref. A. Make a note of these measurements.
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The height adjusting dot is located in front of the low-beam lamp on the headlight lens.
Fig. 1, Headlight
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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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- On the screen or wall, mark the locations of each headlight bulb center using the measurements found in step 2. See Fig., ref. 2 and ref. 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 Fig..
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Measurement: 25 ft (7.6 m)
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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
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- See 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 as shown, see Table. to 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: inches (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