GM Service Manual Online
For 1990-2009 cars only

Headlamp Bulb Replacement Low Beam

Removal Procedure

    Caution: Refer to Halogen Bulb Caution in the Preface section.

  1. Raise the hood.
  2. Disconnect the wiring harness connector from the rear of the relevant headlamp assembly.
  3. Remove the upper radiator shroud. Refer to Fan Shroud Replacement in Engine Cooling.
  4. If removing the right hand low beam headlamp bulb, it may be necessary to remove the battery to gain access. Refer to Battery Replacement in Engine Electrical.

  5. Object Number: 1256363  Size: SH
  6. From within the engine compartment, remove the outboard dust cap (1) from the rear of the headlamp assembly (2) by turning the dust cap (1) counterclockwise, and pulling it away from the headlamp assembly (2).
  7. Disconnect the wiring connector (4) from the low beam bulb (3) by squeezing the 2 tabs together and pulling the wiring connector (4) down from the low beam bulb (3).

  8. Object Number: 1256366  Size: SH
  9. Rotate the low beam bulb (1) counterclockwise and remove the low beam bulb (1) from the low beam bulb holder (2).

Installation Procedure


    Object Number: 1256366  Size: SH
  1. Install the low beam bulb (1) into the low beam bulb holder (2).
  2. Turn the low beam bulb (1) clockwise to lock into place.

  3. Object Number: 1256363  Size: SH

    Important: The different sized locating lugs on the bulb base and mating cut-outs in the bulb holder allow the bulb to seat correctly in one orientation only. This ensures correct relationship of the bulb to the reflector.

  4. Install the low beam bulb connector (4) by pushing it into the base of the low beam bulb (3) until the tabs engage.
  5. Important: Inspect the seal in the dust cap to ensure that it is not damaged and that it is seated correctly. Replace the seal if it is damaged.

  6. Install the dust cap (1) onto the rear of the headlamp assembly (2)
  7. Important: The different size lugs on the dust cap and the mating cut-outs in the headlamp assembly ensure that the dust cap can only be installed in one orientation. The chamfered flats of the cap need to be facing inboard for the cap to install.

  8. Lock the dust cap (1) into place by turning clockwise.
  9. Connect the wiring harness connector to the rear of the headlamp assembly.
  10. Install the battery, if removed. Refer to Battery Replacement in Engine Electrical.
  11. Install the upper radiator shroud. Refer to Fan Shroud Replacement in Engine Cooling.
  12. Aim the headlamps, if required. Refer to Headlamp Aiming .
  13. Close the hood.

Headlamp Bulb Replacement High Beam

Removal Procedure

    Caution: Refer to Halogen Bulb Caution in the Preface section.

  1. Raise the hood.
  2. Disconnect the wiring harness connector from the rear of the relevant headlamp assembly.
  3. Remove the upper radiator shroud. Refer to Fan Shroud Replacement in Engine Cooling.
  4. If removing the right hand high beam headlamp bulb, it may be necessary to remove the battery to gain access. Refer to Battery Replacement in Engine Electrical.

  5. Object Number: 1257428  Size: SH
  6. From within the engine compartment, remove the inboard dust cap (1) from the rear of the headlamp assembly (2) by turning the dust cap (1) counter clockwise, and pulling it away from the headlamp assembly (2).

  7. Object Number: 1257429  Size: SH
  8. Disconnect the wiring connector (3) from the high beam bulb (1) by squeezing the 2 tabs together and pulling the wiring connector (3) down from the high beam bulb (1).
  9. Rotate the high beam bulb (1) counterclockwise and remove the high beam bulb (1) from the high beam bulb holder (2).

Installation Procedure


    Object Number: 1257429  Size: SH
  1. Install the high beam bulb (1) into the high beam bulb holder (2).
  2. Turn the high beam bulb (1) clockwise to lock into place.
  3. Important: The different sized locating lugs on the bulb base and mating cut-outs in the bulb holder allow the bulb to seat correctly in one orientation only. This ensures correct relationship of the bulb to the reflector.

  4. Install the high beam bulb connector (3) by pushing it into the base of the high beam bulb (1) until the tabs engage.

  5. Object Number: 1257428  Size: SH

    Important: Inspect the seal in the dust cap to ensure that it is not damaged and that it is seated correctly. Replace the seal if it is damaged.

  6. Install the dust cap (1) onto the rear of the headlamp assembly (2)
  7. Important: The different size lugs on the dust cap and the mating cut-outs in the headlamp assembly ensure that the dust cap can only be installed in one orientation. The chamfered flats of the cap need to be facing inboard for the cap to install.

  8. Lock the dust cap (1) into place by turning clockwise.
  9. Connect the wiring harness connector to the rear of the headlamp assembly.
  10. Install the battery, if removed. Refer to Battery Replacement in Engine Electrical.
  11. Install the upper radiator shroud. Refer to Fan Shroud Replacement in Engine Cooling.
  12. Aim the headlamps, if required. Refer to Headlamp Aiming .
  13. Close the hood.