So, I took the plunge! I purchase the MMI High versions of the LCD and Main Unit (in addition to the center console with touchpad) for my 2015 Audi A3 (United States). My issues: 1) One connector did not 100% fit. The Sirius antenna needed massaging, but then it fit. Anyone know why?? 2) I installed the components and nothing works! Not the radio, Sirius, GPS, telephone, nothing. Is that normal??? Not even a radio signal? 3) Now, I know that component protection removal and coding may be required. But, I am new to this. Someone please help! 4) Is it possible that I need a new wiring harness also? I've asked around and most say that I do not need a new harness. I only need to remove the component protection and coding. 5) The unit says that it does not have navigation installed. I assume I must bring to the dealer for this? 5) I was given (for free) the AMI interface, but no cable. Does anyone know a part number?