GM Service Manual Online
For 1990-2009 cars only

    Object Number: 421401  Size: SH
  1. Install the ignition switch assembly (2) into the lock cylinder housing assembly.
  2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the 2 tapping screws (1) into the ignition switch assembly (2).
  4. Tighten
    Tighten the tapping screws to 1.5 N·m (13 lb in).

  5. Connect the connector (3) to the ignition switch assembly (2).
  6. Install the upper and lower trim covers. Refer to Steering Column Trim Covers - Disassemble - Off Vehicle .
  7. Enable the inflatable restraint steering wheel module. Refer to Enabling the SIR System in SIR.