"Service Air Bag"

The service air bag light has come on in my duramax. From the few hours of research I have done it could be one of a dozen of sensors or wiring connections. They say the best way to diagnose the issue is to find a code reader that can read the trans. computer as this will be able to also read the air bag system computer. Any one have one of these in Houston? Or know of a good shop that does?

Idk how chevys srs system works but on a ford it flashes two different patterns, example 2 times, waits 5 seconds or so then flashes 7 times would be a code 27 then you can look it up. If it just stays on this wont work, but if it works :D

ended up taking it to the dealer, it was a shorted out bumper impact sensor