- under 17 you connect the camera signal ' - under 9 you connect + 12v from reverse - and power supply for the camera + 12v and - (it should be after the ignition somewhere in the back)
Connect the camera power to the reversing lights. So that it turns on when you throw back. Connect the cinch cable between the radio and the camera and let them know if it works. There is a lot of info here: https://www.elektroda.pl/rtvforum/topic2764809.html