i got a avic n2 out of a wrecked car the aera where the face plate goes on is busted but i can snap the plate on i hooked only the head unit up the the battery to see if it will come on b4 i get any futher in2 the repair so my question is do u have to have the head unit hooked up before it will power on?

You have to have the head unit and hideaway brain hooked up for it to turn on