Headlamp Alignment
Vehicles equipped with the optional High Intensity Discharge (HID) headlamps include an automatic headlamp leveling feature, which uses axle sensor inputs to the Automatic Headlamp Leveling Module (AHLM) to automatically adjust the headlamp level to compensate for changes in vehicle cargo or passenger load. This feature must be disabled in order to successfully perform a manual headlamp alignment.
Due to the linear nature of the headlamp cutoff, a properly aimed low beam headlamp will project the top edge of the high intensity pattern on the alignment screen from the horizontal line to 50 millimeters (2 inches) below the horizontal line for domestic market vehicles, or to 104 millimeters (4.125 inches) below the horizontal line for export market vehicles. No horizontal (right/left) adjustment is required for this headlamp beam pattern in domestic market vehicles. Export market vehicles have a second horizontal (right/left) adjustment screw (2) provided. The high beam pattern will be correct when the low beams are properly aimed.
- Turn the headlamps ON and select the LOW beams for vehicles in all markets except Japan. Vehicles for the Japanese market should have the headlamp HIGH beams selected.
- Use a screwdriver to access the vertical adjustment screw (3) on the back of each front lamp unit housing (1). The adjustment screw is accessed through an oblong clearance hole provided in the right or left fender close out panel between the square hood bumper and the hexagonal hood stop. Rotate the headlamp vertical adjustment screw to adjust the beam height as required.
- For export markets only, use a screwdriver to rotate the headlamp horizontal adjustment screw (2) on the back of each front lamp unit housing to adjust the beam horizontally to the right or left as required.