2012 Buick LaCrosse Owner's Manual - Page 356

10-30 Vehicle Care 6. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being adjusted. This allows only the beam of light from the headlamp being adjusted to be seen on the flat surface. 4. At the wall, measure from the ground upward (A) to the recorded distance from Step 3 and mark it. 5. Draw or tape a horizontal line (B) on the wall the width of the vehicle at the height of the mark in Step 4. Notice: Do not cover a headlamp to improve beam cut-off when aiming. Covering a headlamp may cause excessive heat build-up which may cause damage to the headlamp. Uplevel 7. Locate the vertical headlamp aiming screws, which are under the hood near each headlamp assembly. 8. Turn the vertical aiming screw until the headlamp beam is aimed to the horizontal tape line. Turn it clockwise or counterclockwise to raise or lower the angle of the beam. Base