Sir Coil Assembly

The SIR coil assembly consists of 2 current-carrying coils. It is installed in the steering column and allows rotation of the steering wheel while maintaining continuous (directly wired) contact of the deployment loop through the inflator module. SIR system does not use slip rings to transmit current from column to steering wheel.

Gold-plated terminals and shorting bar are used on the coil assembly lower steering column Yellow connector. The shorting bar shorts the circuits to the main coil and inflator module when the lower steering column connector is disconnected. This shorts the circuit to the inflator module, preventing unwanted deployment of the air bag when the steering column and other SIR components are serviced.