Firstly, calm down. The Airbag warning light means there is a problem. Where it is, no one can say, until a diagnostic check has been carried out. There is a central control unit, individual air bags in the Dashboard and each front seat.
It is very rare for the Control Unit or individual air bags to be at fault if no one has been fiddling with them. The most common cause is wiring/wiring loom plugs and on the California the front seats are commonly the problem because the wiring from the base to the seat has to cope with not just fore and aft movement but swivelling through 180* . I would suggest, going by comments on the Forum your problem will be one of the seats and as has been mentioned there is a longer wiring loom for the passenger seat available. Either way I would be surprised if VWCC would not offer to contribute towards if not all the cost of repair, provided your vehicle has been serviced by VW.
As Calikev said if you can get someone to reset it then that may be that. Before doing that check all the plugs from seat base to seat are firmly connected.