Ducato Hi all

[Alexplose]

New Ducato 2020 owner, searching for wires, and were to locate them.

 

[Alexplose]

Firstly, I'm looking for rear speaker wiring, the plug in the back of the system has already the rear wires present, I'd like to know where they are going and where to plug my rear speakers.

Can anyone help me identifying those wires ?


And finally:
There is another plug with :
-a green/white (possibly reverse)
-a purple/black (???)
-a grey/white (???)


Any help appreciated