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Thumperx.
I am in the process of completing my retrofit, pretty much the same as yours, minus the iPhone cradle and use hub.
How did you route the aux output wires to the ULF. I understand that pins 1,2,3,4 go to pins 23,22,5,4 of the ULF, but I can't find any write up on a BMW OEM wiring set used for this purpose. So this leads me to believe a wiring harness was made. Is that what you had to do? If so, what parts did you use?
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