I just bought a set of 2001 a4 pwr/heated seats, and need to wire them up. They are not going back in anything related to Audi. I have been looking for a wiring diagram for the power and heated functions in the seats and haven't found what I need yet. How do I go about wiring the heated seat so that there is some degree of adjustability to the heat setting. The plug to the heated portion has 4 wires. Any help would be appreciated. Thanks