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I have no idea about the wiring of it. Yes it was compatible with European E39's, but not US ones. while it was compatible with European AND US X5's. That tells me that something is clearly different. My guess is that to make it compatible in the US X5 you need that retrofit cable and perhaps them same thing is true in principle for a US E39, however they never seemed to make a retrofit cable for that situation.
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Meister, I've looked up wiring diagrams and I can not find anywhere where they differentiate the euro e39 to the US e39? Would you know if there is a special site to get euro wiring digrams? I'm guessing that the retrofit cable is basically the car side of the 10 pin plug with the wires that you have to splice in to the car. That will not help as I already have a plug on my car. Thanks for your help.