I found this old post in search, http://www.bonnevilleclub.com/forum/...ht=heated+seat
To disable the SIR (airbag) system, you need to pull the fuse and then disconnect the yellow wire under the drivers side knee bolster. There is a connector that runs up the steering column and one to the left which goes to the control module. Its that bright yellow wire that you want to disconnect.
Those seats are heavy and you may need a hand getting them out of the car.
Also there is lots of trim that needs to be pulled off, try and do this in a warm shop as I think the cold will make the plastic brittle?