2009 Buick LaCrosse Owner's Manual - Page 318

To adjust the vertical aim on the headlamps: 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. 4. Draw or tape a horizontal line (B) on the wall the width of the vehicle at the height of the mark in Step 4. 5. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being adjusted. Do not place directly on the headlamp. This allows only the beam of light from the headlamp being adjusted to be seen on the flat surface. 6. 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. 7. 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. 1. Open the hood. See Hood Release on page 5-11. 2. Measure the distance from the ground to the aim dot on the low-beam headlamp. Record the distance. 3. At the wall measure from the ground upward (A) to the recorded distance from Step 3 and mark it. 5-48