2002 Cadillac DeVille Owner's Manual - Page 353

2. Measure the distance from the ground to the aim dot on each lamp; if left low beam, subtract two inches. Record this 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. 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. 6-43