Cadillac 1998 DeVille Owner's Manual page 327

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2. Check the vertical headlamp aim first. Keep in mind
that your vehicle needs to be on a level surface. Turn
the vertical aiming screw until the bubble inside the
level is centered at "0."
3. After the vertical aim is correct, check the horizontal
aim for each headlamp and adjust as necessary. Turn
the horizontal aiming screw until the end
of the
screw aligns with the "0."
correct after the horizontal aim adjustment. Adjust
as necessary.
4. Recheck the vertical aim to make sure it remains
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