I do not have navagaition. When i hit the r/t button nothing changes on my screens. I looked at the back cover and i only saw a amp plugged in. I took a pic. Ill try to put it up soon. How do i get a bt devise to make my car bt work?

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2003 x5 3.0 . 114,000 mile. Im new to the bmw word so excuse any dumb questions. Lol.