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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1544 (Supplemental Inflatable Restraint System) >> Repair Instructions >> Inflatable Restraint Steering Wheel Module Coil Centering
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Inflatable Restraint Steering Wheel Module Coil Centering

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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.
    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 conditions before centering the SIR coil:
    • The front wheels of the vehicle are in the straight ahead position.
    • 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. NOTE: If a double wire harness strap is installed onto the wire harness assembly and the column, you must reuse the holder for the wire straps during the installation.
  2. Remove the wire harness strap or straps where necessary.
    3. Fig 2: View Of Coil POM Letters
    GM2297940Courtesy of GENERAL MOTORS CORP.
  3. Hold the SIR coil and look at the side with the letters POM (1).
  4. Rotate the coil hub clockwise until the coil ribbon stops.
    5. CAUTION: Do not rotate the SIR coil more than 3 turns counterclockwise from the center position. There is no stop in the counterclockwise direction. Rotating the SIR coil more than 3 turns counterclockwise from the center position will damage the SIR coil, causing an inflatable restraint malfunction.
  5. From the clockwise stop, rotate the coil hub slowly counterclockwise approximately 3.3 turns. Place the uplead connector (2) in the 12 o'clock position. Ensure the flat wire cable loop appears in the centering window (4). This is the CENTER position.
  6. If you have the orange lock pin (3), use the lock pin to lock the SIR coil in the center position.

    If you do not have the orange lock pin, hold the SIR coil in the center position.

  7. Align the SIR coil with the horn tower and slide the SIR coil onto the steering shaft assembly.
  8. If a double wire harness strap is installed onto the wire harness assembly and the column, you must route the wires up against the steering column. One wire harness strap will surround one lead from the coil to the steering column. The other wire harness strap will surround all other leads to the steering column.
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