Have a similar problem, but the warning light stays on all the time. I have a list of other things that need to be done, and this one gets added to the list.
Won't be taking my Nitro to the dealer I bought it from because the airbag light was on when I test drove the vehicle. Mentioned that to the sales rep and his reply was that "it's a common problem with Chrysler vehicles"
Being that I was 100mi from home, and they couldn't do a diagnostic that day, I said I'll have it checked out by a dealer closer to home.
Guess they weren't too concerned about my safety...