GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Body and Accessories 🢒 Doors 🢒 Front Side Door Lock Replacement

Removal Procedure
  1. Remove the trim panel. Refer to Front Side Door Trim Panel Replacement .
  2. Remove the water deflector. Refer to Front Side Door Water Deflector Replacement .
  3. Remove the inside handle rods from the handle.

    4. Object Number: 308342 Size: MH
  4. Remove the clip securing the inside handle rods to the door.
  5. Cut off the outside handle rod-to-lock clip from the lock using the side cutters.

    6. Unscrew the remainder of the clip from the outside handle rod. Discard the clip.


    Object Number: 308343 Size: SH
  6. Remove the screws (1,2,3) securing the lock to the door.
  7. Remove the lock from the door with the inside handle rods attached to the lock.
  8. Remove the electrical connectors.
  9. Remove the inside handle rods from the lock.

Installation Procedure

    Object Number: 308342 Size: MH
  1. Install the inside handle rods to the lock.
  2. Install the door lock in the position through the access hole in the door inner panel.
  3. Install the electrical connectors.

    4. Object Number: 308343 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Important: The Loctite® Blue GM P/N 12345382 or equivalent should be used prior to fasteners installation.

  4. Install the door lock screws (1,2,3) in the proper fastener tightening sequence, top (1) then bottom (2) and middle (3).

    5. Tighten
    Tighten the door lock screws to 10 N·m (89 lb in).


    Object Number: 308344 Size: SH
  5. Snap a NEW outside handle rod-to-lock clip onto the door lock lever.
    6. 5.1. Position the outside door handle rod in the clip to eliminate any free play in the outside door handle.
    5.2. Snap the clip cover closed over the threaded outside door handle rod.
  6. Install the clip to the inside handle rods.
  7. Install the handle rods to the handle.
  8. Install the water deflector. Refer to Front Side Door Water Deflector Replacement .
  9. Install the trim panel. Refer to Front Side Door Trim Panel Replacement .
  10. Inspect the lock system for the proper operation.