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I put some front seats from a e53 X5 which were heated into my 05 X3, which wasn't originally equipped with heated front seats, and discovered the wiring for heated front seats was missing entirely - no power wires to the switches (I got the correct switch panel for my X3 with heated seat controls,) and no wiring from the switches to the seat. So last month I scored the connectors for the switch panel and the seats, just need to run some wiring.
So, my guess is the wiring from the switches to the seats isn't present in your X3.
I can tell you that when I put heated M6 vert seats into my 01 330ci vert when I plugged them in the heat worked immediately, but the previous seats were heated as well.
I have also managed to put the massaging seats in my former e38, just some simple wiring for that.
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