Hi, can anyone help, i have changed the seats in my A4 1.8 T B7 2005, all was well until i changed the front passenger seat, now with this seat in, the air bag light will not extinguish, i have had the car scanned, and the only fault that comes up is an open circuit on the seat airbag isolation switch, however my car was never fitted with this switch, has anyone come across this problem ??? please help.