George, I have been messing around with my windows a bit and have found how this function works. There is an additional relay in the center console of the car wired to the power window switch module. The relay is external and wired via a pig-tail. The system looks simple enough. I am looking to tear out the relay an pin it out. The realy should be a normal DP/DD, and the driver's window switch seems to be like the others. I figure that all that would be needed is to add 3 more relays and solder a few wires to the remaining passenger window switches. Figure less than a hundred bucks for materials.