Under the seats, there are a couple of connector blocks, you cna feel them by reaching underneath the seat...
Disconnect battery and then try to disconnect the connectors and then reattach. (You could undo the 4 seat bolts so you can see what your doing!) and then reattach the battery and if the connectors were loose it should go off (the light that is, not the airbag!!)
But from the code, its more likly to be in the steering wheel like steve said!