2006 Cadillac DTS Owner's Manual - Page 345

Headlamp aiming is done with the vehicle's low-beam headlamps. The high-beam headlamps will be correctly aimed if the low-beam headlamps are aimed properly. To adjust the vertical aim, do the following: 1. Open the hood. See Hood Release on page 5-11 for more information. 3. Measure the distance from the ground to the center line running through the lens of the headlamp. Record the distance. 4. At the wall or other flat surface, measure from the ground upward the recorded distance from Step 2 and mark it. 5. Draw or tape a horizontal line the width of the vehicle at the wall or other flat surface where it was marked it 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. 6. 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. 2. Find the center line running through the lens of the headlamp. 5-45