Description & Operation

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. 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.

Supplemental Inflatable Restraint (SIR) system is designed to supplement protection provided by driver-side and passenger-side seat belts. A frontal collision of sufficient force will deploy driver-side and passenger-side air bags. Steering column and knee bolsters also absorb collision energy. Sensing and Diagnostic Module (SDM) maintains a 23 Volt Loop Reserve (VLR) to provide deployment energy for air bag modules for up to one minute after loss of battery voltage.

SIR system consists of SDM, driver-side and passenger-side air bag modules, front end discriminating sensor, SIR coil assembly and AIR BAG warning light.