If your air bag light is on your air bag module has likely fail. This happen to me years ago, the fix? I bought a used air bag module from ebay and replaced mine. Once I installed it and hooked the battery up, the light reset itself and ive been fine since.

Just a reminder, as long as that light is on you have no air bag. The air bag module is located on the center floor underneath the dash (where the shifter is, it is in front underneath the center stack). It is not hard to access but you'll have to remove the whole center shifter area as if you were replacing your cup holder. It can be done.