Hi I have just done this conversion myself without having any wiring to the seats from car .change the centre consul which had the movement switches to the seats. While consul was out pick earth wire from behind hand brake position this needs to be plugged into black wire in the brown plug under seat with jump across to o/p wire .then take a feed from B/p wire in plug to white and orange wire on your rear window switch in centre consul .this way when ignition is off there is no power to seats .hope this helps someone in future ..it is all fused by seat fuses plus rear window fuses .thanks adejg