I want to change the radio/CD player with an after market radio with reverse camera. Mine has the sat nav unit at the top. There are 3 plugs in the back of the radio. Would anyone know the pinouts for these plugs?. Radio is 86120-48490 . my next step would be to trace them backwards. Unsure about which would go to the display unit though. I read somewhere it might cause problems with the ac controls?? Any help appreciated. Thanks.