System Description

The SIR system consists of the following components:
^ An inflatable Restraint Sensing and Diagnostic Module (SDM).
^ An inflatable Restraint Steering Wheel Module.
^ An inflatable Restraint Steering Wheel Module Coil.
^ An inflatable Restraint Instrument Panel (IP) Module.
^ An AIR BAG warning lamp in the instrument cluster.

The deployment loops contain the following components:
^ The Inflatable Restraint Sensing and Diagnostic Module (SDM).
^ The Inflatable Restraint Steering Wheel Module Coil (SIR coil assembly).
^ The Inflatable Restraint Steering Wheel Module (driver inflator module).
^ The Inflatable Restraint IP module (passenger inflator module).
^ connector wires.

The deployment loops supply current through the inflator modules. This will cause deployment of the air bags. Deployment occurs when the SDM detects vehicle velocity changes severe enough to warrant deployment.

The SDM contains a sensing device (Accelerometer) that converts vehicle velocity changes to an electrical signal. The SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the inflator modules deploying the air bags.