Ok looking at the wiring again here is my plan of attack so far.

6 is my ibus

2 will be ground

The switched 12v positive is the tricky part.

I show 7 and 11 both have 12 volts but I cant tell if they are key switched or not.

They look to be hot all the time. So I will have to fine a spot to pull a key switch power source from. I guess the fuse box is where I will have to pull from which I am dreading. I kill ripped open and bleeding every time I reach my arm into that dash.

I would pull off the radio's amp or antenna switching but I don't know how much power this interface pulls and I am already powering the reverse camera off those.

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Aftermarket E53 Radio Install