Airbag systems air part of a huge circuit includin the seat belts, the airbags all the way around and then must be tested as a circuit. It usually also involves an invertia switch.
I will provide you with wiring diagrams but keep in mind many states have insurance laws, or some companies, that if a certified tech does not fix system and it does not deploy in accident you are out of luck.
Images (Click to enlarge)
Wednesday, March 28th, 2012 AT 8:46 PM