Moin moin together, I have a small concern and have already found a lot of it, but nothing leads to the goal. I have found the right audio 50 2.5 NTG. I just want to upgrade AUX. To do this I got an adapter with a jack at Amazonas which is simply clicked into the block C. The previous pin test did not bring anything then I found 2 others who are also without success. I also don’t get the radio switched to AUX. Kan n with someone how can I change the radio and which is the correct pin assignment? Currently I have pin 3,4 and 9,10 occupied. On my block are pin 1,3,7 and 9 already occupied. Can not find out what. Operation is still normal possible. On the radio is aux via diagnosis unlocked. For advice I would be grateful. I attach a picture of the radio. Ohja es sit a sprinter w906 Year of construction 2013