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You can also if you so chose replicate the whole mechanism with a switch and a couple of resistors. All that is inside the buckle is a switch that changed the resistance by cutting out a resistor once the buckle is inserted, the car detects this change and deactivates the passenger airbag. Too test this theory I made a little switch box with the approprioate resisors in it, it seems to work fine. The nice thing is that the car diagnoses if the system is working and tells you so by flashing the airbag light for 60 seconds to show it has been deactivated. I have the circuit I made somewhere if anyone is interested, $10 in bits from radioshack and it was complete.
The only tricky bit is getting the connector for under the seats, I managed to get one but it is an awkward part to get hold of. You could of course just cut the connector off and replace it with a more common one or splice in to the wires.
Chris.
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