I have an 08 sedan with the airbag light indicating a fault, you will need to take it to a dealer or find someone who has a scanner that can read the body control module. There's nothing you can do to the occupancy sensors or wiring that will make it go away it's been logged and is there to stay until cleared. Also to note that the manual states that when there's a fault detected that the airbags are disabled.
Also to note I don't think you'll find many shops that will touch the BCM out of a liability concern so I hope you find someone who can to it under the table...