Hello everyone, I am running out of ideas. I have a 1990 5.0 mustang and the airbag light has been on since i bought it last year. I had the blue module box sent to airbag systems Inc and they said they repaired it. I replaced the back up battery supply in the glove compartment area. Still the constant light remains. The only conclusion I have is that airbag systems Inc is full of crap and did not fix it. I really don't want to spend another 100 bucks for a used one off eBay to test my theory not to mention the pain in the rear it is to change.