Headlamp Horizontal Aiming - Cadillac DeVille 2005 Owner's Manual

Headlamp aiming is done with the vehicle low-beam
lamps. The high-beam lamps will be correctly aimed if
the low-beam lamps are aimed properly.
The headlamp aiming devices are located under the
hood near the headlamps.
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.

Headlamp Horizontal Aiming

If your vehicle has the horizontal aim indicators, turn the
horizontal aiming screw (A) until the indicator (B) is
lined up with zero.
Once the horizontal aim is adjusted, then adjust the
vertical aim.
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