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Did you figure this out? I'm doing this right now with my 2012 e93 (CIC) -- Road Top MMI (basically the same as the Andream), backup camera and front camera. I am running power from "12v backup camera" and "GRD" to the backup camera and "12v ACC" and "GRD" to the front camera mounted on back of the rearview mirror. I also connected the "Camera Detect" output to the little red wire coming off the Yellow video cable. As I understand it, this is the correct way to wire two cameras. I am not using an existing 12v source like the backup cameras or overhead light and I am not grounding to the car chassis. If this doesn't power either camera then I am going to put a multimeter up to the "12v ACC", "Backup Detect", and "Ground" to see what is actually happening when I turn it on. I also have an external monitor I can use to test the signal to verify it is a signal problem and not a power problem (or visa versa).
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