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Headlamp Aiming Procedure

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Complete the following before adjusting the headlamps:
    • Remove any snow, ice or mud from the vehicle.
    • The tires must be properly inflated.
    • The vehicle must be fully assembled and all other work stopped while the headlamp aiming is being done.
    • The vehicle should contain cargo or be loaded to represent normal vehicle use.
    • The suspension should be completely settled.
  2. Align the left tires of the vehicle (1) with the reference line (2) extending from the screen.
    Fig 1: Aligning Left Tires Of Vehicle With Reference Line
    G02095106Courtesy of GENERAL MOTORS CORP.
  3. Ensure that the headlamps are even with the 7.62 m (25 ft) mark on the reference line.
    Fig 2: Locating Distance Between Headlamps And Reference Line
    G02095107Courtesy of GENERAL MOTORS CORP.
  4. Measure from the floor to the headlamp aiming dot located at the center of the low beam headlamp in order to obtain the distance between point one and point two.
    Fig 3: Measuring Distance Between Floor & Headlamp Aiming Dot
    G02095108Courtesy of GENERAL MOTORS CORP.
  5. Using the measurement obtained from step 4, measure from the floor (3) to the screen (4) and from the floor (2) to the screen (1) and make temporary markings on the screen (1 and 4).
  6. Use a piece of tape between 1 and 4 in order to create the horizontal line on the screen.
    Fig 4: Identifying Horizontal Line On Aiming Screen
    G02095109Courtesy of GENERAL MOTORS CORP.
  7. Measure the difference between the headlamp aiming dot and the reference line (3).
  8. Transfer that measurement to the aiming screen (1) in order to determine the left vertical line.
    Fig 5: Measuring Difference Between Headlamp Aiming Dot & Reference Line
    G02095110Courtesy of GENERAL MOTORS CORP.
  9. Measure the distance between the left headlamp aiming dot (3) and the right headlamp aiming dot (2).
  10. Use that measurement on the aiming screen (4) in order to determine the positioning of the right vertical line.
  11. Set the park brake.
  12. Start the vehicle.
  13. Turn the headlamps on.
    Fig 6: Measuring Distance Between Left Headlamp Aiming Dot & Right Headlamp Aiming Dot
    G02095111Courtesy of GENERAL MOTORS CORP.

    Important:  If it is difficult to differentiate between the separate headlight patterns, it may be necessary to block the path of light of the headlamp not being adjusted. Do not cover headlamp, this may cause excessive heat build up.

  14. This illustration represents the visual optics left (VOL) pattern.
    Fig 7: Identifying Visual Optics Pattern (Left)
    G02095112Courtesy of GENERAL MOTORS CORP.
  15. This illustration represents the visual optics right (VOR) pattern.
    Fig 8: Identifying Visual Optics Pattern (Right)
    G02095113Courtesy of GENERAL MOTORS CORP.
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