I have a 1992 Ford Taurus LX (3.8L) that I didn't use for about a month because of a bad starter. When I started it, the air bag warning light began flashing a code 13 ( Air Bag Circuit - Shorted to Ground). The weather had been quite rainy and humid during the time the car sat. The starter has been replaced but the problem remains. I would appreciate any advice on what I can check myself before I need to send it to a shop. Thank you for your help in advance.