Fog/Driving Lamp: Adjustments
FRONT LAMP AIMING
VEHICLE PREPARATION FOR LAMP ALIGNMENT
1. Check for and replace any burnt out bulbs.
2. Repair or replace any faulty, worn or damaged body or suspension components that could hinder proper lamp alignment.
3. Verify proper tire inflation pressures.
4. Remove any accumulations of mud, snow or ice from the vehicle underbody and clean the front lamp lenses.
5. Verify there is no load in the vehicle (cargo or passengers), except for the driver.
6. The fuel tank should be full. Add 2.94 kilograms (6.5 pounds) of weight over the fuel tank for each estimated gallon of missing fuel.
7. Verify correct vehicle suspension height.
LAMP ALIGNMENT SCREEN PREPARATION
The following procedure prepares a suitable front lamp alignment screen.
1. Tape a line on a level floor 7.62 meters (25 feet) away from and parallel to the flat wall that will be used as the lamp alignment screen. The level floor will be used as the horizontal zero reference.
2. An adjacent wall or floor member that is perpendicular to the alignment screen can be used as the vertical zero reference. If there is no adjacent wall or floor member that is perpendicular to the screen, tape a second line on the floor perpendicular to both the alignment screen and the first line, and outboard of either side of where the vehicle will be positioned. This will be used as the vertical zero reference.
3. Position the vehicle so the side of the vehicle is parallel to the vertical zero reference, and the front of the lamp lenses are in the vertical plane of the parallel line taped on the floor 7.62 meters (25 feet) away from the screen.
4. Rock the vehicle side-to-side three times to allow the suspension to stabilize.
5. Jounce the front suspension three times by pushing downward on the front bumper and releasing.
6. Measure the distance between the optical center of one of the lamps being aimed (head or fog) and the floor (horizontal zero reference). Transfer this measurement to the alignment screen with a piece of tape placed horizontally to the floor. This line will be used as the lamp horizontal reference.
7. Measure the distance between the vertical zero reference and the optical center of the nearest lamp being aimed (head or fog). Transfer this measurement to the alignment screen with a piece of tape placed vertically across the appropriate (head or fog) lamp horizontal reference. This is the centerline reference for the first lamp.
8. Measure the distance on center between the first and the second lamp being aimed. Transfer this measurement to the alignment screen with a second piece of tape placed vertically across the appropriate (head or fog) lamp horizontal reference. This is the centerline reference for the second lamp.
HEADLAMP ALIGNMENT
There are two different kinds of headlamp aiming procedures:
- Visual Aim Optical Left (VOL)
- Visual Aim Optical Right (VOR)
The VOL or VOR is embossed on the lower front of each headlamp unit.
VOL HEADLAMP AIMING
With the horizontal centerline of the headlamp (2) transferred on the wall, measure down 53 mm (2.1 in). This line (1) will be the vertical aiming mark. Using the left side of the headlamp vertical centerline (3), adjust the headlamp unit so the residual light from the headlamp, not the hot spot, is even with the line (1) that was marked previously 53 mm (2.1 in) below the horizontal centerline (2). The ideal alignment should be (5). The right headlamp aiming will be the same, but using the area left of right headlamp vertical centerline (not shown).
1. Turn the headlamps on and select the low beams.
2. Rotate the headlamp vertical adjustment screw (horizontal on export) on each lamp to adjust the beam height as required.
VOR HEADLAMP AIMING
With the horizontal centerline of the headlamp (1) transferred on the wall, this line (1) will be the vertical aiming mark. Using the right side of the headlamp vertical centerline (two for the left and four for the right), adjust the headlamp unit so the residual light from the headlamp is even with the horizontal centerline (1). The ideal alignment should be (5).
1. Turn the headlamps On and select the Low beams.
2. Rotate the headlamp vertical adjustment screw (and horizontal on export) on each lamp to adjust the beam height as required.
FOG LAMP ALIGNMENT
A properly aimed front fog lamp projects a pattern on the alignment screen 100 millimeters (4 inches) below the fog lamp centerline and straight ahead of the lamp.
1. Turn the fog lamps on.
2. Rotate the fog lamp vertical adjustment screw (2) on each lamp to adjust the beam height as required.