Description & Operation

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Accidental air bag deployment is possible. Personal injury may result. Read and follow all WARNINGS and AIR BAG SAFETY PRECAUTIONS before working on air bag system or related components.

SIR system is designed to supplement protection provided by driver-side and passenger-side seat belts. A frontal crash of sufficient force will deploy driver-side and passenger-side air bags. Steering column and knee bolsters below instrument panel also absorb crash energy. SDM also maintains a 23 Volt Loop Reserve (23 VLR) energy supply to provide deployment energy for up to one minute after loss of battery voltage.

SIR system consists of Sensing and Diagnostic Module (SDM), driver-side and passenger-side air bag modules, SIR coil assembly, AIR BAG warning light, driver-side and passenger-side knee bolsters.