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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 980 (Supplemental Inflatable Restraint System) >> Repair Instructions >> Inflatable Restraint Steering Wheel Module Coil Replacement (Coil and Harness Assembly) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Block Tooth Of Steering Shaft Assembly In 12 O'clock Position
    GM293254Courtesy of GENERAL MOTORS CORP.
    NOTE: The new SIR coil assembly will be centered. Improper alignment of the SIR coil assembly may damage the unit, causing an inflatable restraint malfunction.
    NOTE: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the SIR coil assembly to become uncentered, which may cause damage to the coil assembly.
  1. Verify the following:
    • The wheels on the vehicle are straight ahead.
    • ThatJ 42640  is installed or the ignition switch is in the LOCK position.
    2. Fig 2: View Of SIR Coil
    GM396373Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not remove the centering tab from the new SIR coil until the installation is complete. If the SIR coil does not come with a centering tab, you MUST center the SIR coil.
  2. If reusing the existing coil it MUST be centered, refer toInflatable Restraint Steering Wheel Module Coil Centering in Steering Wheel and Column.
    3. Fig 3: SIR Wiring Harness (Steering Column)
    GM1561385Courtesy of GENERAL MOTORS CORP.
  3. Align the SIR coil assembly (1) with the horn tower on the turn signal cancel cam assembly and install onto the steering shaft.
    4. Fig 4: Seating The Retaining Ring Into The Groove On The Steering Shaft Assembly
    GM1561384Courtesy of GENERAL MOTORS CORP.
  4. Firmly seat the retaining ring (3) into the groove on the steering shaft assembly (2).
  5. Remove and discard the centering tab from the new SIR coil.
  6. Route the wire harness assembly around the column and install the wire harness straps.
  7. Connect the connectors of the wire harness assembly.
    8. Fig 5: Removing/Installing Upper Trim Cover
    GM283271Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the upper trim cover (1) and secure by using 2 TORX® head screws (2).

    Tighten:  Tighten the screws to 1.5 N.m (13 lb in).

    9. Fig 6: Removing/Installing Lower Trim Cover
    GM283270Courtesy of GENERAL MOTORS CORP.
  9. Install the lower trim cover (2) and secure by using 2 TORX® head screws (1).
    10. Fig 7: Upper & Lower Trim Cover Tabs
    GM283273Courtesy of GENERAL MOTORS CORP.
  10. Verify that the tabs on the lower trim cover (1) engage with the tabs on the upper trim cover (2). Snap the tabs together.

    Tighten:  Tighten the screws to 1.5 N.m (13 lb in).

    11. Fig 8: Removing/Installing Tilt Lever
    GM82174Courtesy of GENERAL MOTORS CORP.
  11. On vehicles with a tilt column, align the tilt lever into the steering column.
  12. Slide the tilt lever handle into the steering column until the handle locks into position.
    13. Fig 9: Steering Wheel, Shaft & Nut
    GM294367Courtesy of GENERAL MOTORS CORP.
  13. Install the steering wheel onto the steering shaft. Refer toSteering Wheel Replacement in Steering Wheel and Column.
  14. Enable the SIR system. Refer to SIR Disabling and Enabling Zone 3 .
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