GM Service Manual Online
For 1990-2009 cars only

Ignition Lock Cylinder Replacement - On Vehicle Without Key

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Disable the supplemental inflatable restraints (SIR) system. Refer to Disabling the SIR System in SIR.
  3. Remove the steering column shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle .

  4. Object Number: 491355  Size: SH
  5. Drill out the locking button (2) on the rear of the housing assembly (1) using an angle drill.

  6. Object Number: 491353  Size: SH
  7. Remove the ignition lock cylinder (1) by pulling outward from the steering column.
  8. Disconnect the electrical connector (3) from the ignition lock cylinder (1).

Installation Procedure


    Object Number: 491353  Size: SH

    Important: Ensure that all the metal shavings are cleaned from the steering column and ignition housing assembly.

  1. Connect the electrical connector (3) to the ignition lock cylinder (1).
  2. Insert the ignition lock cylinder (1) into the housing assembly while rotating the key approximately 5 degrees counter - clockwise.
  3. Install the steering column shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle .
  4. Enable the SIR system. Refer to Enabling the SIR System in SIR.
  5. Connect the negative battery cable.
  6. Perform the Passlock Learning Procedure. Refer to PASSLOCK Changing - Components Description in Theft Deterrent.

Ignition Lock Cylinder Replacement - On Vehicle With Key

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Disable the supplemental inflatable restraints (SIR) system. Refer to Disabling the SIR System in SIR.
  3. Remove the steering column shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle .

  4. Object Number: 491353  Size: SH
  5. Turn the ignition lock cylinder (1) to the RUN position.

  6. Object Number: 491355  Size: SH
  7. Push the locking button (2) on the rear of the housing assembly (1).
  8. Remove the ignition lock cylinder by pulling outward from the steering column.

  9. Object Number: 491353  Size: SH
  10. Disconnect the electrical connector (3) from the ignition lock cylinder (1).

Installation Procedure


    Object Number: 491353  Size: SH
  1. Connect the electrical connector (3) to the ignition lock cylinder (1).

  2. Object Number: 491355  Size: SH
  3. Insert the ignition lock cylinder into the housing assembly (1) while rotating the key approximately 5 degrees counter - clockwise.
  4. Install the steering column shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle .
  5. Enable the SIR system. Refer to Enabling the SIR System in SIR.
  6. Connect the negative battery cable.
  7. Perform the Passlock Learning Procedure. Refer to PASSLOCK Changing - Components Description in Theft Deterrent.