Cadillac 2007 XLR Owner's Manual page 411

7. Locate the vertical headlamp aiming screws,
which are under the hood near each headlamp
assembly.
The adjustment screw can be turned with a
6 mm male hex.
9. The top edge of the cut-off should be
positioned at the bottom edge of the horizontal
tape line.
8. Turn the vertical
aiming screw until
the headlamp
beam is aimed to
the horizontal
tape line.
10. Make sure that the light from the headlamp is
positioned at the bottom edge of the horizontal
tape line. The lamp on the left (A) shows
the correct headlamp aim. The lamp on the
right (B) shows the incorrect headlamp aim.
11. Repeat Steps 7 through 9 for the opposite
headlamp.
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