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Don't be confused by the fact that the center console switch has power already. It may not be power for seat heating. You can check by removing connector from back of center console switch(it's brown if I remember) and checking at pin position 7. There should be a very thick red wire(with stripe on side) in that position. If it is there, you have the power for your seats at the console switch. If not,you will need power from the fuse block/terminal to the center console switch. You will then need to run four wires from the console switch to the underseat connector(car side). One is a larger wire for power, the other is a smaller wire for temperature signal(one of each for each seat). You will need to pick up a ground connection, easily done under the dash on either side of car behind plastic panel where speaker is. I had to install my own wiring to retrofit my 2006 Z4 3.0 with heated seats.
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