usually on the seat if you reach in from the back you can pull them out its just a plastic mesh and cut the wire.its a simple two wire job.the tricky bit is taking your seat cover off that depends on the car and how nice the design is.Eg. on a cavvy u just pull the cover of around the edges,but make sure you have a good battery/alternator and you run them through a relay cos they draw a hell of a lot of amps!!!oh and on a sadistic note its great to turn them on under your passenger and not tell them ,then just watch the realisation that somethings not quite right down below!!!
The Fiat Cinquecento
Fun While It Runs