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Inflatable Restraint Steering Wheel Module Coil Centering

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.
  1. Verify the following conditions 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.
    Fig 1: View Of Block Tooth In 12 O'Clock Position
    G01569359Courtesy of GENERAL MOTORS CORP.
  2. If the front (5) of the SIR coil has a centering window (4), and the back side (2) includes a spring service lock (1), perform the following steps:
    1. 2.1. Hold the SIR coil with the face up.
    2. 2.2. While depressing the spring service lock, rotate the coil hub clockwise until the coil ribbon stops.
    3. 2.3. Rotate the coil hub slowly, counterclockwise, until the centering window appears yellow and both arrows (3) line up.
    4. 2.4. Release spring service lock between the locking tab. The SIR coil is now centered.
    5. 2.5. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
    Fig 2: Identifying SIR Coil Centering Window & Spring Service Lock
    G01569360Courtesy of GENERAL MOTORS CORP.
  3. If the front (4) of the SIR coil has a centering window (3), and the back side (1) includes NO spring service lock, perform the following steps:
    1. 3.1. Hold the SIR coil with the face up.
    2. 3.2. Rotate the coil hub clockwise until the coil ribbon stops.
    3. 3.3. Rotate the coil hub slowly, counterclockwise until the centering window appears yellow and both arrows (2) line up. This is the CENTER position.
    4. 3.4. While holding the coil hub in the CENTER position, align the SIR coil with the horn tower and slide onto the steering shaft assembly.
    Fig 3: Identifying SIR Coil Centering Window & Back Side
    G01569361Courtesy of GENERAL MOTORS CORP.
  4. If the front side (3) of the SIR coil has NO centering window, but the back side (2) includes a spring service lock (1), perform the following steps:
    1. 4.1. Hold the SIR coil with the back side up.
    2. 4.2. While depressing the spring service lock, rotate the coil hub in the direction of the arrow (4) until the coil ribbon stops.
    3. 4.3. Still pressing the spring service lock, rotate the coil hub in the opposite direction 21/2 revolutions.
    4. 4.4. Release the spring service lock between locking tabs. The SIR coil is now centered.
    5. 4.5. Align the centered SIR coil with the horn tower and slide onto the steering shaft assembly.
    Fig 4: Identifying SIR Coil Spring Service Lock & Directional Arrow
    G01569362Courtesy of GENERAL MOTORS CORP.
  5. For the front side (2) of the SIR coil has NO centering window, and the back side (1) includes NO spring service lock, perform the following steps:
    1. 5.1. Hold the SIR coil with the face up.
    2. 5.2. Rotate the coil hub in the direction of the arrow until the coil ribbon stops.
    3. 5.3. Rotate the coil hub, slowly, counterclockwise, for 21/2 revolutions. This is the CENTER position.
    4. 5.4. 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.
    Fig 5: Identifying SIR Coil Without Centering Window & Without Spring Service Lock
    G01569363Courtesy of GENERAL MOTORS CORP.
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