GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD - RHD 🢒 Restraints 🢒 SIR 🢒 Steering Wheel Inflatable Restraint Module Coil Replacement

Removal Procedure

    Object Number: 421400 Size: SH
  1. Disable the SIR system. Refer to Disabling the SIR System .
  2. Remove the steering column trim covers. Refer to Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column - Tilt.
  3. Remove the wire harness straps (4) from the wire harness assembly (5).
  4. Remove the SIR steering wheel module coil retaining clip (1).
  5. Remove the SIR steering wheel module coil (2).
  6. Remove the wave washer (3) from the steering column upper shaft.

Installation Procedure

    Object Number: 293254 Size: SH
  1. Align the block tooth on the upper shaft to the 12 O'clock position.

    2. Object Number: 421395 Size: SH

    Notice: Ensure all fasteners are securely seated before applying needed torque. Failure to do so may result in component damage or malfunctioning of steering column.

  2. Install the wave washer (1) to the steering column upper shaft.

    3. Object Number: 322951 Size: SH

    Important: 

       • Verify that the SIR steering wheel module coil is centered.
       • The SIR steering wheel module coil becomes uncentered under the following conditions:
          - The steering column is separated from the steering gear and allowed to rotate.
          - The centering spring is pushed down, letting the hub rotate while the coil is removed from the steering column.
       • If the SIR steering wheel module coil becomes uncentered, refer to Inflatable Restraint Coil Centering - Off Vehicle in Steering Wheel and Column - Tilt.

  3. Align the SIR steering wheel module coil (4) with the horn tower on the turn signal cancel cam (1)
  4. Install the pre-centered SIR steering wheel module coil (4) to the steering column upper shaft (2).
  5. Remove the centering tab and discard.

    6. Notice: Gently pull on the lower coil assembly wire in order to remove any wire kinks inside of the column assembly. Verify that there are NO kinks or bends in the SIR coil assembly wire. If a kink or bend is present, interference may occur with the shaft lock mechanism. Turning the steering wheel may cut or damage the wire.

  6. Install the SIR steering wheel module coil retaining ring (3) to the steering column upper shaft. Verify that the SIR steering wheel module coil retaining ring (3) is firmly seated in the groove on the steering column upper shaft (2).

    7. Object Number: 421403 Size: SH
  7. Install wire harness straps (4) to the wire harness assembly (5).
  8. Install the steering column trim covers. Refer to Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column - Tilt.
  9. Enable the SIR system. Refer to Enabling the SIR System .