my mate works for renault, he said the airbag may go off when disconnecting the wires under the seats...
ON MINE THEY NEVER HAVE DONE,
I've taken them all apart before, and refitted the stupid connectors on passeneger seat and renewed connections on driver's seat. awkard to say the least
I've a 2001 mkII 172 airbags in seats, pre-tensioners etc.
There is some variance in the type of connectors though
John