The inflatable restraint sensing and diagnostic module (SDM) provides continuous monitoring of the air bag circuits by conducting a sequence of checks. If a malfunction is detected the SDM will store a diagnostic trouble code (DTC) and command the instrument panel cluster (IPC) to illuminate the SIR system AIR BAG indicator. The AIR BAG indicator will remain illuminated until the malfunction has been repaired.
Before any further diagnosis is made the Air Bag system will need to be checked for codes to determine what area of the system to look at. There are a few service bulletins, but I would need diagnostic codes to see if they apply.
When the light is on the air bags will be disabled, if an accident were to occur they would not deploy.
You can check with your local auto parts stores (AutoZone, Napa, etc.) to see if they have the capability to check for air bag codes. They will usually check the codes for free.
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