Perform SIR System Diagnostic Check
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
SIR system diagnostic check should always be starting point for any SIR diagnostics. It checks for proper AIR BAG warning light operation and SIR trouble codes using both flash code and scan tool methods. See SIR DIAGNOSTIC SYSTEM CHECK under DIAGNOSTIC TESTS.