2000 Cadillac DeVille Owner's Manual - Page 339
2000 Cadillac DeVille Manual
Page 339 highlights
Headlamp Horizontal Aiming Turn the horizontal aiming screw (A) until the indicator (B) is lined up with zero. If you believe your headlamps need horizontal (left/right) adjustment, follow the horizontal aiming procedure. If you believe your headlamps need only vertical (up/down) adjustment, follow only the vertical aiming procedure. Adjustment screws can be turned with an E8 TorxR socket or T15 Torx screwdriver. Once the horizontal aim is adjusted, then adjust the vertical aim. 6-40
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