I purchased the OEM Auxiliary Input Kit's for my 2006 BMW X5 4.8is w/ Navigation. BMW part number 82 11 0 149 391. It's installed, and everything is put back together, but the Aux mode is not showing up like it's supposed to. I cycle through the modes, and no AUX mode. I took the radio back out and messed with the connection to see if maybe it was loose or something, but everything looked good. What am I missing?