I am using this same setup. Swapping the white and yellow wires on one end does end up with the same results as the DR3400. On my 07 Lexus GS350 I can Start/Stop the car, and Lock/Unlock the doors.
That said, when I refresh it doesn't correctly update the status. May show the engine is on when it is not or battery only shows 12v, when I know it is 13.6v. Strange thing is these functions seemed to work with the white and yellow wires in their original positions. Neat, but pretty useless since it then won't start the car.