Diagnostic Aids
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
If battery voltage is outside normal operating range, (9-16 volts) AIR BAG warning light will turn on with no DTC's set. AIR BAG warning light will also come in if an internal malfunction has occurred in IPC or SDM or if loss of serial data communication has occurred between SDM and IPC.