GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Important: The vehicle must be in PARK prior to ignition cylinder removal.

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Disable the SIR system. Refer to SIR Disabling and Enabling .
  3. Remove the steering column trim covers. Refer to Steering Column Trim Covers Replacement .
  4. Remove the park lock cable from the bottom of the housing. Refer to Park Lock Cable Replacement .

  5. Object Number: 874786  Size: SH
  6. Insert the key into the ignition and rotate to the RUN position.

  7. Object Number: 943579  Size: SH
  8. Depress the locking button through hole on the side of ignition module assembly with a thin pick-type tool.
  9. Rotate the ignition cylinder back from the ACC position.
  10. Slide the lock cylinder to the ignition housing.

Installation Procedure


Object Number: 964632  Size: SH

Important: The actuator blade within the ignition module must be in the ACC position to install the lock cylinder assembly. If rotated, reposition the actuator blade to the ACC position using needle nose pliers.


    Object Number: 874786  Size: SH

    Important: If you are installing a new lock cylinder, refer to Key and Lock Cylinder Coding .

  1. Insert key into ignition lock cylinder and install the cylinder into the lock housing.
  2. Rotate the lock cylinder in the housing. Verify proper rotation.
  3. Install the park lock cable to the bottom of the housing. Refer to Park Lock Cable Replacement .
  4. Install the steering column trim covers. Refer to Steering Column Trim Covers Replacement .
  5. Enable the SIR system. Refer to SIR Disabling and Enabling .
  6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .