Description & Operation

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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 dual stage air bag modules. A side impact of sufficient force will deploy side impact air bag module on side of collision. Steering column and knee bolsters also absorb collision 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 voltage.

SIR system consists of Sensing and Diagnostic Module (SDM), dual stage driver-side and passenger-side air bag modules, driver-side and passenger-side Electronic Frontal Sensors (EFS), left and right single stage side impact air bag modules, left and right Side Impact Sensors (SIS) and AIR BAG warning light.