service air bag light on and off\ what to do?

Since air bags are as safety system, I would encourage you to have it checked out professionally, at a GM dealership. Having it checked at A GM dealer has the advantage of all the factory information, and if any new bulletins have been released regarding the concern. Possibly the repair may be covered under warranty. We would be happy to check this out for you, call me direct at 757-886-1819 to schedule an appointment.