
The problem is that the extended AUX connection is not working, since the USB BOX has an active source detection (when you plug in into a connector, it uses that as the source), but with defined priorities (AUX > iPOD > USB). I currently have 2 thing plugged in to the USB BOX, one is the USB cable (which isn't active as the AUX, just by mechanical detection) and the iPOD cable. So, my usb stick is always connected, and it will be used as the source for music, when I plug in the iPod, it will override the USB, and it will be used as the source (one source at a time). The song names will not be displayed (which doesn't bother me really, I usually drive with the map always displayed on the screen, so the song titles aren't stabbing me in the eye).
The USB BOX was placed behind the manual parking brake, not fixed, just stuck in the metal casing, it isn't moving so far, all the cables (which are approx. 2 m long!) from the lighter style adapter are tightly rolled and stuck next to the brake lever. This is visible in the images that follow. I will think about the possible solution with the AUX cable and enabling the detection of the input, but don't think it possible without tampering with the USB BOX directly (which I don't want to do at this point), and since I won't be using the AUX (the audio L/R input is still in the glove compartment, in working state, if I enable that source in the radio menu).
The iPOD cable was my idea, just a slight touch out of the usual, pulling the cable under the main connector. The rubber padding L profile that is found in the handrest was modified (read: made a hole through), keeping it close to a perfect circle, and placing the cable and the socket through it. The black plastic panel (which houses the OBD2 connector at the top, also needed to have the original hole widened a bit).
[step by step procedure] ...

[final look]

My conclusion is that this solution is near perfect, in a technical view. Some newer units (more expensive) are placing the AUX/USB connector in the handrest by default installation (no iPod connection!), I was thinking of getting that socket separately, but it is being connected with non-standard cable connection (regarding the connection socket), which would require further modification to the cable, before connecting it to the USB BOX.
Any questions, comments, feel free to ask me, while I'm still here on the forum ...