GM Service Manual Online
For 1990-2009 cars only

Disassembly Procedure


    Object Number: 867643  Size: SH
  1. Carefully remove cap from lock cylinder using a thin bladed screwdriver.
  2. Important: When shutter is removed, the shutter springs may fall out.

  3. Remove shutter and shutter springs.

  4. Object Number: 867538  Size: SH
  5. Insert key into cylinder, turn it a quarter turn clockwise and remove cylinder from housing.
  6. If necessary, remove pawl from slot in housing.

  7. Object Number: 867706  Size: SH

    Important: When the tumblers are removed from the lock cylinder tumbler, springs may fall out.

  8. Push tumblers out of lock cylinder using a thin bladed screwdriver.
  9. If necessary, remove sidebar assembly by pushing it inward while tapping the cylinder, causing it to fall out.

Assembly Procedure


    Object Number: 863019  Size: SH
  1. Select the correct tumblers for the desired code by the number stamped on the tumbler.

  2. Object Number: 879225  Size: SH

    Important: Make sure sidebar and tumbler springs are in place before installing tumblers.

  3. Install tumblers by applying downward pressure until they lock into position.

  4. Object Number: 867538  Size: SH

    Important: When key is inserted into properly coded lock cylinder, all tumblers except the retainer tumbler will be flush with the lock cylinder.

  5. Install pawl into slot in housing.
  6. Insert key into cylinder, insert cylinder into housing and rotate quarter turn counterclockwise.

  7. Object Number: 867643  Size: SH
  8. Install shutter spring and shutter.
  9. Install cap to lock cylinder.