Ive just noticed, you have an E91.
That changes everything.
I too have one and am in the process of trying to work everything out as the set up for antennas and other stuff is unique to the E91 from any other model.
Without wanting to derail this thread, so far I have found this and am trying to research further.
I might start a separate thread for E91 research
http://bmwfans.info/parts-catalog/E9...enna_diversity