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.

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: Checking Block Tooth Of Steering Shaft Assembly Is In 12 O'Clock Position Before Centering SIR Coil
Courtesy of GENERAL MOTORS CORP.
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: Centering Window (Front Side) & Spring Service Lock (Back Side) Of SIR Coil (1 Of 4)
Courtesy of GENERAL MOTORS CORP.

Fig 3: Centering Window (Front Side) & Spring Service Lock (Back Side) Of SIR Coil (2 Of 4)
Courtesy of GENERAL MOTORS CORP.

Fig 4: Centering Window (Front Side) & Spring Service Lock (Back Side) Of SIR Coil (3 Of 4)
Courtesy of GENERAL MOTORS CORP.

Fig 5: Centering Window (Front Side) & Spring Service Lock (Back Side) Of SIR Coil (4 Of 4)
Courtesy of GENERAL MOTORS CORP.