Test it, unplug the black wire and try starting the car. Than try remote start it and press the brake pedal afterwards and see if it shuts down. I did 12V because it's constant 12V, meaning the button is complete off if theres no power to it. Try it, I don't believe it will do anything, but it could work.Could the black ground wire going to the plug be the splice point to disable the switch? Seems like it would be safer to route a pair of ground wires through the car instead of a 12V.