SIR Steering Wheel Module Coil - Centering

CENTERING PROCEDURE





Improper alignment of the Supplemental Inflatable Restraint (SIR) coil assembly may damage the unit causing an inflatable restraint malfunction.

Important: A new SIR coil assembly will be pre-centered.

1. Verify the following before centering the SIR coil assembly:
- 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 or J-42640 is installed in the upper tilt head assembly.





2. If the front (5) of the SIR coil assembly has a centering window (4), and on the back side (2) a spring service lock (1), perform the following steps:
2.1. Hold the coil assembly with the face up.
2.2. While depressing the spring service lock, rotate the coil hub clockwise until the coil ribbon stops.
2.3. Rotate the coil hub slowly, counter clockwise, until the centering window appears yellow and both arrows (3) line up.
2.4. Release spring service lock between the locking tab. The SIR coil is now centered.
2.5. Align the centered SIR coil assembly with the horn tower and slide onto the steering shaft assembly.





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:
3.1. Hold the coil assembly with the face up.
3.2. Rotate the coil hub clockwise until the coil ribbon stops.
3.3. Rotate the coil hub slowly, counter clockwise until the centering window appears yellow and both arrows (2) line up. This is center position.
3.4. While holding the coil hub in center position, align the SIR coil assembly with the horn tower and slide onto the steering shaft assembly.





4. If no centering window is present on the front side (3) of the SIR coil assembly, but a spring service lock (1) is on the back side (2), perform the following steps:
4.1. Hold the SIR coil assembly with the back side up.
4.2. While depressing the spring service lock, rotate the coil hub counter clockwise until the coil ribbon stops.
4.3. Still pressing the spring service lock, rotate the coil hub in the opposite direction 2 1/2 revolutions.
4.4. Release the spring service lock between locking tabs. The SIR coil is now centered.
4.5. Align the centered SIR coil assembly with the horn tower and slide onto the steering shaft assembly.





5. For no centering window on the front side (2) of the SIR coil assembly and no spring service lock on the back side (1), perform the following steps:
5.1. Hold the coil assembly with the face up.
5.2. Rotate the coil hub clockwise until the coil ribbon stops.
5.3. Rotate the coil hub, slowly, counter clockwise, for 2 1/2 revolutions. This is center position.
5.4. While maintaining the coil hub in center position, align the centered SIR coil assembly with the horn tower and slide onto the steering shaft assembly.