GM Century/Lumina/Grand Prix/Intrigue 1997-2000

Door Locks

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To properly evaluate the lock system after a replacement part has been installed, the following operational check may be made.

  1. Insert the key into the outside door lock cylinder. While holding the key in the neutral (pull-out) position, actuate the key inside the locking button to the fully locked position and back to the fully unlocked position. There must be no forced movement of the key out of the neutral position during the entire cycle. The key must be able to be removed when the inside locking button is held in both the fully locked and unlocked positions.
  2.  
  3. Turn the key to the fully locked position and return it to the neutral (pull-out) position. Actuate both the outside and inside handles to ensure that the door will not open.
  4.  
  5. Turn the key to the fully unlocked position and return it to the neutral (pull-out) position. Actuate both the outside and inside handles to make sure the door will open.
  6.  

REMOVAL & INSTALLATION



Note that the manufacturing process for many inside-the-door uses heavy-duty pull-rivets that must be drilled out to remove components. If heavy-duty pull-type rivets and the tools used to set them are not available, use care when choosing substitute fasteners.


CAUTION
When removing a door trim panel or switch plate, the ignition switch must be in the OFF position. This will eliminate the possibility of shorting out the switch if a flat-bladed tool, awl or metal object is used to remove the switch from the harness. In addition, disconnect the power window switch when working inside the driver's door. When operated, the express down feature allows the door window to drop very quickly, without stopping, which could cause personal injury.

Lock Module

GM calls the inside-the-door lock components a "Lock Module". Do not attempt repairs to correct door lock problems. Always replace the lock module assembly.

  1. If equipped with a Theftlock® radio, disable this anti-theft feature. Disconnect the negative battery cable.
  2.  
  3. Remove the door trim panel as outlined in this section.
  4.  
  5. Loosen the water deflector (plastic sheet) to gain access to the lock module.
  6.  
  7. Remove the screw and nut securing the cover assembly to the door.
  8.  
  9. Remove the door handle cover assembly.
  10.  
  11. Remove the lock cylinder-to-lock rod and outside handle-to-lock rod.
  12.  
  13. Remove the screws securing the lock assembly to the door.
  14.  
  15. Remove the rivets securing the lock module to the door. Use the following procedure:
    1. Use a small pin punch to knock out any remaining rivet mandrel from the center of the rivet(s).
    2.  
    3. Using a 3 / 16 inch (5mm) drill bit, drill out the pull rivet(s) securing the lock module to the door.
    4.  

  16.  
  17. Disconnect the power lock electrical connector and remove the lock module.
  18.  



Click image to see an enlarged view

Fig. Front door lock system-Monte Carlo shown, Lumina similar



Click image to see an enlarged view

Fig. Typical W-Body rear door lock system

To install:

  1. Install the lock module through the access hole in the door inner panel.
  2.  


WARNING
It is important, when performing the next step, that the lock be held tight against the door facing while installing the screws. All screws must be driven at a right angle (90 degrees) to the door facing to prevent cross-threading or stripping of screws or door lock attachment holes. It is required that the screws be tighten to a specific torque of 89 inch lbs. (10 Nm).

  1. Install the lock assembly screws at a 90 degree angle to prevent cross threading. Torque the screws to 89 inch lbs. (10 Nm).
  2.  
  3. Install the power lock connector, if so equipped.
  4.  
  5. Install the rivets securing the lock module-to-door. Use 3 / 16 inch diameter by 1 / 4 inch long rivets.
  6.  
  7. Install the outside handle and lock cylinder lock rods. Check the locking operation before going any further.
  8.  
  9. Install the door handle cover, retaining screws and nuts.
  10.  
  11. Install the water deflector and door trim panel.
  12.  
  13. Connect the negative battery cable and check all door operations for completion of repair.
  14.  

Lock Cylinder


Click image to see an enlarged view

Fig. Typical door lock cylinder arrangement at handle

  1. If equipped with a Theftlock® radio, disable this anti-theft feature. Disconnect the negative battery cable.
  2.  
  3. Remove the door handle cover.
  4.  
  5. Remove the lock cylinder-to-lock rod.
  6.  
  7. Remove the anti-theft shield.
  8.  
  9. Remove the lock cylinder from the door.
  10.  

To install:

  1. Install the lock cylinder, anti-theft shield and shield retaining screw.
  2.  
  3. Connect the cylinder lock rod and handle cover assembly.
  4.  
  5. Check all door operations.
  6.  
  7. Connect the negative battery cable.
  8.  

Power Lock Actuator

The optional power door lock system has motor actuators in each door. The system is activated by a control switch on each front door. All locks are activated when any switch is pushed up or down. Each actuator has an internal circuit breaker which may require one to three minutes to reset after service.

  1. If equipped with a Theftlock® radio, disable this anti-theft feature. Disconnect the negative battery cable.
  2.  
  3. Remove the door trim panel and water deflector as outlined in this section.
  4.  
  5. If the actuator is retained by pull-rivets, drill out using a 3 / 16 inch drill bit.
  6.  
  7. If the actuator is retained by screws, remove the two actuator retaining screws located at opposite corners.
  8.  
  9. Disconnect the electrical connector and linkage.
  10.  
  11. Remove the actuator through the access hole.
  12.  

To install:

  1. Install the actuator linkage, electrical connector and retaining screws.
  2.  
  3. Check for proper operation by cycling the system.
  4.  
  5. Install the water deflector and trim panel.
  6.  
  7. Connect the negative battery cable.
  8.  

 
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