Lock the doors and wait for a minute or so and then measure the pin 13, it should drop to 0 Volt. But you do not have any can so i am not really shure what will happen, try it out.
Bye the way, have you checked if you have any fault codes on the radion/navigation and what in sutch case?
Bye the way, have you checked if you have any fault codes on the radion/navigation and what in sutch case?