there are many people have the problem about the radio , BT, speaker,etc.so i show the installation guide here, you can check it when you have the similar problem.and if you know the procedure, you may know what wrong is it . hoping it will help you . http://www.autoradiodvdgpstv.com/car-dvd-install/BMW-X1-GPS-Navigation-TV-System.rar http://www.autoradiodvdgpstv.com/user-manual/car-dvd/BMW-DVD-Player-GPS-Navigation-TV-System-User-Manual-H8.rar