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