I had an air bag code 13. I pulled the air bag fuse to diagnose and put it back in the wrong slot. This caused code 12 to appear. By the time I figured out what had happened, the car had been started a few times. When I replaced the fuse I got good ol code 51, which is internal fuse blown. Is this normal behavior for the unit? If the fuse is missing, it fries its internal fuse? I wanted to know if it was indeed the missing fuse that caused this because I don't think code 13 would have done it. Also, can these modules be repaired (fuse replaced)?