Airbag Steering Wheel Module Coil Centering

Special Tools 

J-42640  Steering Column Anti-rotation Pin

1. Verify the following conditions before centering the inflatable restraint steering wheel module coil:
   Fig 1: View Of Block Tooth Of Steering Shaft Assembly In 12 O'clock Position

   Courtesy of GENERAL MOTORS COMPANY
   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.
   • The wheels on the vehicle are pointed straight ahead.
   • The block tooth (1) of the steering shaft is in the 12 o'clock position.
   • The ignition and start switch is in the LOCK position or anti-rotation pin J-42640  pin is installed.
2. If the front side (3) of the inflatable restraint steering wheel module coil does NOT have a centering window and the back side (2) does NOT have a spring service lock (1), perform the following steps:
   Fig 2: Centering SIR Coil (Without Centering Window, Without Spring Service Lock)

   Courtesy of GENERAL MOTORS COMPANY
   1. Hold the coil with the face up.
   2. Rotate the coil hub clockwise until the coil ribbon stops.
   3. Rotate the coil hub, slowly, counter clockwise, for 2.5 revolutions. This is center position.
   4. While maintaining the coil hub in center position, align the centered coil with the horn tower and slide onto the steering shaft.