Sir Coil Assembly
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
SIR coil assembly consists of 2 or more current-carrying coils. SIR coil is attached to steering column and allows rotation of steering wheel, while maintaining continuous continuity of driver-side air bag deployment loop.