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. Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:

       • Air bag deployment
       • Personal injury
       • Unnecessary SIR system repairs
    In order to avoid the above conditions, observe the following guidelines:
       • Refer to SIR Component Views in order to determine if you are performing service on or near the SIR components or the SIR wiring.
       • If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to Disabling the SIR System.

  3. Disable the supplemental inflatable restraint (SIR) system. Refer to Disabling the SIR System in SIR.
  4. Remove the steering column trim covers. Refer to Steering Column Trim Covers Replacement - On Vehicle .

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

  7. Object Number: 564005  Size: SH
  8. Remove the ignition lock cylinder (1) by pulling outward from the steering column.
  9. Disconnect the electrical connector (2) from the ignition lock cylinder (1).
  10. Remove the metal shavings from the steering column and ignition lock housing assembly.

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 trim covers. Refer to Steering Column Trim Covers 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 Learn Procedure. Refer to Programming Theft Deterrent System Components 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. Caution: This vehicle is equipped with a Supplemental Inflatable Restraint (SIR) System. Failure to follow the correct procedure could cause the following conditions:

       • Air bag deployment
       • Personal injury
       • Unnecessary SIR system repairs
    In order to avoid the above conditions, observe the following guidelines:
       • Refer to SIR Component Views in order to determine if you are performing service on or near the SIR components or the SIR wiring.
       • If you are performing service on or near the SIR components or the SIR wiring, disable the SIR system. Refer to Disabling the SIR System.

  3. Disable the supplemental inflatable restraint (SIR) system. Refer to Disabling the SIR System in SIR.
  4. Remove the steering column trim covers. Refer to Steering Column Trim Covers Replacement - On Vehicle .

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

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

  10. Object Number: 491353  Size: SH
  11. 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 trim covers. Refer to Steering Column Trim Covers 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 Learn Procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent.