Electric tow hitch Cayenne

[Jacob117]

Hello, i am in need of some help. I have installed an electric tow hitch, and I have the control box in place + the button to move it down. But the wiring the the button to the box I can’t find anywhere.. so I was thinking of making my own. But in that case I need to know where the wiring goes and what goes where.. but I can’t find anything on the internet, so I was thinking maybe some of you guys have tried this before? And maybe got a picture of a diagram or something?
It’s a 2012 Cayenne.
Regards