GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 25300-D Headlamp Aimer

Removal Procedure

  1. Turn OFF the headlamp switch.

  2. Object Number: 325531  Size: SH

    Important: Do not move the adjustment screws.

  3. Remove the retaining ring screws from the headlamp.
  4. Remove the retaining ring from the headlamp.
  5. Remove the headlamp from the housing.
  6. Disconnect the electrical connector from the headlamp.

Installation Procedure


    Object Number: 325531  Size: SH
  1. Connect the electrical connector to the headlamp.
  2. Install the headlamp to the housing.
  3. Install the retaining ring to the headlamp.
  4. Install the screws to the retaining ring.

Adjustment Procedure


Object Number: 200966  Size: SH

Use the 2 adjusting screws, one horizontal screw (2) and one vertical screw (1), to adjust the aiming of each headlamp. These 2 screws move the mounting ring against the tension of the coil spring.

Some state and local authorities have specific requirements for aiming headlamps. Follow these requirements.

Replacing a headlamp usually does not require an aiming adjustment. However, do check the aim. Use the J 25300-D or equivalent. The instrument manufacturer supplies instructions for using the headlamp aimer.

Refer to Headlamp Aiming for additional information.