GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Century 🢒 Body and Accessories 🢒 Body Control System 🢒 Ignition and Start Switch Replacement

Removal Procedure

    Caution: Refer to SIR Caution in the Preface section.


    Object Number: 688978 Size: SH
  1. Disable the SIR system. Refer to SIR Disabling and Enabling in SIR.
  2. Remove the trim covers from the steering column. Refer to Steering Column Trim Covers Replacement .
  3. Disconnect the steering column electrical connectors.

    4. Object Number: 360577 Size: SH
  4. Remove the steering column wiring harness tie straps (3).

    5. Object Number: 415293 Size: SH
  5. Remove the wire harness (1) from the steering column and from the wire harness strap (2).
  6. Remove and dispose of the small wire harness straps from the wire harness assembly (1).

    7. Object Number: 306234 Size: SH
  7. Disconnect the multifunction switch electrical connectors (2) from the bulkhead connector (1).

    8. Object Number: 306267 Size: SH
  8. Remove the key alarm connector (1) from the ignition lock cylinder case assembly (2) using the following procedure:
    9. 8.1. Rotate the key alarm connector (1) 90 degrees.
    8.2. Pull the key alarm connector (1) out of the ignition lock cylinder case assembly (2).
    8.3. Remove the passkey connector from the ignition lock cylinder case assembly (2).

    Object Number: 389639 Size: SH
  9. Slide the ignition switch assembly (3) out of the ignition lock cylinder case assembly (1).

Installation Procedure

    Object Number: 389639 Size: SH
  1. Slide the ignition switch assembly (3) into the ignition lock cylinder case assembly (1).

    2. Object Number: 306267 Size: SH
  2. Install the key alarm connector (1) into the ignition lock cylinder case assembly (2).
    3. 2.1. Push the key alarm connector (1) into the ignition lock cylinder case assembly (2).
    2.2. Rotate the key alarm connector (1) 90 degrees so that the key alarm connector (1) locks into place.
    2.3. Install the passkey connector into the ignition lock cylinder case assembly (2).

    Object Number: 306234 Size: SH
  3. Connect the multifunction switch electrical connectors to the bulkhead connector (1).

    4. Object Number: 415293 Size: SH
  4. Install the wire harness assembly (1) to the wire harness strap (2).

    5. Object Number: 360577 Size: SH
  5. Attach new wire harness straps (3) to the wire harness assembly (4).

    6. Object Number: 688978 Size: SH
  6. Connect the steering column electrical connectors to the vehicle.
  7. Install the trim covers to the column. Refer to Steering Column Trim Covers Replacement .
  8. Enable the SIR system. Refer to SIR Disabling and Enabling in SIR.