Headlamp Aiming Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Align the left tires of the vehicle with the reference line extending from the screen with the headlamps aligned with the reference line.
- Remove any snow, ice or mud from the vehicle.
- The vehicle must be fully assembled and all other work stopped while the headlamp aiming is being done.
- The vehicle must contain one person or approximately 160 lb (73 kg).
- Tires should be properly inflated.
- Rock the vehicle to stabilize the suspension.
- Measure from the floor to the reference mark on the headlamp lens (2).
The graphic shows a GMC headlamp. Chevrolet and Oldsmobile are similar.
- At the screen, measure from the floor and place the horizontal tape at the above measured distance.
- Turn the low beam headlamps ON.
- The graphic shows the vertical (1) adjustment, no horizontal adjustments are required.
The graphic shows a GMC headlamp. Chevrolet and Oldsmobile are similar.
Adjust the headlamps to the specifications required by state and local authorities.
- The beam pattern must be positioned as shown in the graphic.
- Adjust one headlamp at a time while blocking the light from the other. The cover must be away from the headlamp.
The following list refers to the callouts in the graphic:
- The low beam centerline reference mark (4).
- Distance from ground to the low beam bulb centerline reference mark (1).
- The ground line (2).
- Horizontal edge of the low beam headlamp pattern (3).
- The edge of the headlamp pattern (3), must be 5 cm (2 in) below the reference mark (4), with the vehicle 7.62 m (25 ft) away.
IMPORTANT:
Do not place a cover directly on the headlamp assembly while the headlamp is ON.