You need to diagnose your vehicle to see what fault code you have for your Airbag System if its just a intermittent fault than you can clear the fault code to see if its coming back or, not if it comes back than you will need to fix the fault to get rid of that warning light................

And most of the time it will be your passenger seat sensor so check the wiring under the seat...........unplug it and plug it back again and try to clear the fault code..............