Checking Headlight Aim
m2+ d 18.02.000
- 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.Headlight Beam Height Adjusting Dot. Measure the distance from the ground to the height adjusting dot on each headlight. Note those distances. See Fig.Headlight Aiming Screen/Wall, Ref. A.
- 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.Headlight Aiming Screen/Wall, Items 2 and 3.
- Turn on the low-beam headlights.
- Identify the center of each beam projection by marking the area of brightest intensity on the wall. The area of brightest intensity should fall on or very near the marks made during step 3. See Fig.Vertical Low-Beam Headlight Variation Limits.
- See Table.Vertical Low-Beam Headlight Variation Limits to
determine the maximum vertical distance allowable between the marks
made in step 3 and the marks made in step 5. If the vertical distance
between the marks made in steps 3 and 5 is greater than the maximum
distance given in Table.Vertical Low-Beam Headlight Variation Limits, adjust
the vertical positioning of that headlight.
Vertical Low-Beam Headlight Variation Limits
Vertical Low-Beam Headlight Variation Limits
Distance Between Ground and Headlight: in (mm)
Desired Variation (see Vertical Low-Beam Headlight Variation Limits, Item 2): in (mm)
Upper Limit (see Vertical Low-Beam Headlight Variation Limits, Item 1): in (mm) up
Lower Limit (see Vertical Low-Beam Headlight Variation Limits, Item 3): in (mm) down
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)
