Indeed! For seat belt pre-tensioners, read bomb. An explosive charge is used to drive plastic or metal balls along a channel to wind up the belt mechanism. Having said that, they should be well-contained unless the mecahnism is actually dismantled. Don't forget the side airbags mounted in some seats.
BIG
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My experience is that pre-tensioners are not fitted to the seat they are bolted to the vehicle floor therefore making changing seats very easy. I am not sure this is for every vehicle so I think the first call is to check where they are anchored. If they are on the seats then I would agree with the caution already expressed in this thread.
I changed seats in a Ford Focus and it took about 1 hour all in, 4 floor bolts and a couple of connectors beneath the seat.
Carse.
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Saab 9000 seats are very popular with the VW Bay window camper fraternity. Pop straight out of a Saab and into the VW.
Extremely comfortable, and are heater-wired.
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I've removed the front seats in my Vectra and they do have the pretensioners integrated with the seats. No big deal to remove, just disconnect the battery, wait 15mins and then handle carefully.
It would make it pretty difficult to swap the seats for something else though, unless the new seats had the appropiate mounting points.
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My GTV has pretensioners fitted to the seats, held onto the frame with a big bolt. I recently swapped my seats for some nicer ones (from another GTV) and had to remove the pretensioners from my standard seats and fit them to the new seats (the pretensioners on the new seats had been deployed). Simple job, only because I was fitting them to the seat they were designed for - if I was fitting some aftermarket seats I'd have to get a mounting bracket made up.
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