2003 Cadillac Seville Owner's Manual - Page 301

Headlamp Horizontal Aiming Turn the horizontal aiming screw (A) until the indicator (B) is lined up with zero. Headlamp Vertical Aiming Nofice: Horizontal aiming must be performed before making any adjustments to the vertical aim. Adjusting the vertical aim first will result in an incorrect headlamp aim. 1. Find the aim dot on the lens of the low beam lamps. Once the horizontal aim is adjusted, then adjust the vertical aim. 2. Measure the distance from the ground to the aim dot on each low beam lamp. 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. 5-52