Sorry if the question sounds a bit strange. My car has a radio, I have already found the CD changer behind the panel to the left, it says “Alpina”. It also works all the input options on the satellite and the display on the dashboard. Only: At all the installation locations specified in the description “Auditorium”, i.e. neither behind a glove compartment flap, nor under the passenger seat, is a device installed. I ask because I have some settings In my search I found a “empty” plug and an obviously intended place for the installation of a device behind the “room” for the tool, i.e. at the rear right, from the fixing point for the tool holder to the outside. What does that mean? Does anyone know this? Thank you for every information! Ernstl