I ordered the recommended patch cord from BMW auto and it plugged into the back of the radio just like it was supposed to. I got a 6 ft. male to male patch cord from Radio Shack to go from my Garmin to the radio but no luck. Using the CD/Intercom/Aux button I went to Aux but I am getting no sound through the unit. Everything else works like it did so I feel good about the install. Any suggestions would be appreciated.