2005 Buick LaCrosse Owner's Manual - Page 320

2. Measure the distance from the ground to the aim dot on the lamp. Record the distance. 3. At the wall or other flat surface, measure from the ground upward the recorded distance from Step 2 and draw or tape a horizontal line the width of the vehicle. The adjustment screw can be turned with a 6 mm male hex. To adjust the vertical aim on the headlamps, do the following: 4. Turn on the low-beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being aimed. This should allow only the beam of light from the headlamp being aimed to be seen on the flat surface. 1. Find the aim dot on the lens of the low-beam lamp. 5-44