GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Envoy - 4WD 🢒 Restraints 🢒 SIR 🢒 Steering Wheel Inflatable Restraint Module Coil Replacement

Removal Procedure

    Important: Disable the SIR system. Refer to Disabling the SIR System .

  1. Remove the steering wheel. Refer to Steering Wheel Replacement in Steering Wheel and Column.
  2. Remove the tilt lever (if equipped). Refer to Tilt Lever Replacement - On Vehicle in Steering Wheel and Column.
  3. Remove the upper and lower shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column -- Standard or Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column -- Tilt.

    4. Object Number: 360577 Size: SH
  4. Pop the wire harness assembly (4) out of the wire harness strap (5).
  5. Remove the 3 wire harness straps (3) from the wire harness assembly.
  6. Remove the wire harness strap (2) from the upper tilt head assembly (1).

    7. Object Number: 361442 Size: SH
  7. Remove the coil assembly retaining clip (1).
  8. Remove the coil assembly (2).
  9. Remove the wave washer (3).

Installation Procedure

    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.

  1. Install the wave washer.
  2. To install the SIR coil assembly, align the block tooth on the race and upper shaft assembly to the 12 O'clock position (1).

    3. Object Number: 293255 Size: SH

    Important: 

       • Ensure that the coil assembly is centered.
       • The coil assembly 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. In the event this occurs. Refer to Inflatable Restraint Coil Centering in Unit Repair.

  3. Install the precentered coil assembly to the steering column. Remove the centering tab and discard.

    4. Object Number: 360591 Size: SH
  4. Install the coil assembly (2) using the following components for alignment:
    5. • The horn tower (1) on the canceling cam assembly inner ring
    • The projections on the outer ring

    Object Number: 360597 Size: SH

    Important: Gently pull on the lower coil assembly wire in order to remove any wire kinks inside of the column assembly. Ensure 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.

  5. Install the coil assembly retaining ring. Ensure that the ring (1) is firmly seated in the groove on the upper shaft assembly (2).
  6. Pop the wire harness assembly (4) into the wire strap (5).
  7. Install the wire harness strap (2) into the wire strap (1).
  8. Install 3 wire harness straps (3) from the wire harness assembly.
  9. Install the upper and lower shrouds. Refer to Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column -- Standard or Steering Column Trim Cover Replacement - On Vehicle in Steering Wheel and Column -- Tilt.
  10. Install the tilt lever (if equipped). Refer to Tilt Lever Replacement - On Vehicle in Steering Wheel and Column.
  11. Install the steering wheel. Refer to Inflatable Restraint Steering Wheel Module Replacement in Steering Wheel and Column.
  12. Enable the SIR system. Refer to Enabling the SIR System .