Clockspring Assembly / Spiral Cable: Description and Operation

SIR Coil Assembly:

Inflator Module - Driver Side:

The SIR coil assembly consists of current carrying coils, two of which are required for air bag operation. They are attached to the lever combination switch and allow rotation of the steering wheel while maintaining continuous contact of the driver deployment loop to the inflator module.

There is a shorting bar on the yellow two-way connector near the base of the steering column which connects the SIR coil to the instrument panel wiring harness The shorting bar shorts the circuits to the SIR coil and driver inflator module when the yellow two-way connector is disconnected. The circuit to the driver inflator module is shorted in this way to help prevent unwanted deployment of the air bag when servicing the steering column or other SIR system components.
(1) SIR Coil Assembly
(2) Driver Inflator Module Connector
(3) Steering Column Pigtail and Connector