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Home › Hummer › 2008 › H3 Base, Automatic › Repair and Diagnosis › External Pages › Different car › Section 455 (Supplemental Inflatable Restraint System) › Repair Instructions › Inflatable Restraint Steering Wheel Module Coil Centering

Inflatable Restraint Steering Wheel Module Coil Centering

WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Block Tooth Of Steering Shaft Assembly In 12 O'clock Position
    GM293254Courtesy of GENERAL MOTORS CORP.
    CAUTION: The new SIR coil assembly will be centered. Improper alignment of the SIR coil assembly may damage the unit, causing an inflatable restraint malfunction.
  1. Verify the following before centering the SIR coil:
    • The wheels on the vehicle are straight ahead.
    • The block tooth (1) of the steering shaft assembly is in the 12 o'clock position.
    • The ignition switch is in the LOCK position.
    2. Fig 2: Centering SIR Coil (With Centering Window & Spring Service Lock)
    GM603737Courtesy of GENERAL MOTORS CORP.
  2. If the front (5) of the SIR coil has a centering window (4), and on the back side (2) a spring service lock (1), perform the following steps:
    1. Hold the SIR coil with the face up.
    2. While depressing the spring service lock, rotate the coil hub clockwise until the coil ribbon stops.
    3. Rotate the coil hub slowly, counterclockwise, until the centering window appears yellow and both arrows (3) line up.
    4. Release spring service lock between the locking tab. The SIR coil is now centered.
    5. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
    3. Fig 3: Centering SIR Coil (With Centering Window, Without Spring Service Lock)
    GM594558Courtesy of GENERAL MOTORS CORP.
  3. If the front (4) of the SIR coil has a centering window (3) and no spring service lock on the back side (1), perform the following steps:
    1. Hold the SIR coil with the face up.
    2. Rotate the coil hub clockwise until the coil ribbon stops.
    3. Rotate the coil hub slowly, counterclockwise until the centering window appears yellow and both arrows (2) line up. This is the CENTER position.
    4. While holding the coil hub in the CENTER position, align the SIR coil with the horn tower and slide onto the steering shaft assembly.
    4. Fig 4: Centering SIR Coil (No Centering Window, Back Side Includes Spring Service Lock)
    GM603738Courtesy of GENERAL MOTORS CORP.
  4. If no centering window is present on the front side (3) of the SIR coil, but a spring service lock (1) is on the back side (2), perform the following steps:
    1. Hold the SIR coil with the back side up.
    2. While depressing the spring service lock, rotate the coil hub in the direction of the arrow (4) until the coil ribbon stops.
    3. Still pressing the spring service lock, rotate the coil hub in the opposite direction 2 1/2 revolutions.
    4. Release the spring service lock between locking tabs. The SIR coil is now centered.
    5. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
    5. Fig 5: Centering SIR Coil (Without Centering Window, Without Spring Service Lock)
    GM603739Courtesy of GENERAL MOTORS CORP.
  5. For no centering window on the front side (2) of the SIR coil and no spring service lock on the back side (1), perform the following steps:
    1. Hold the SIR coil with the face up.
    2. Rotate the coil hub in the direction of the arrow (3) until the coil ribbon stops.
    3. Rotate the coil hub, slowly, counterclockwise, for 2 1/2 revolutions. This is the CENTER position.
    4. While maintaining the coil hub in the CENTER position, align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
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