I have seen similar problems many times, usually an output or input board is bad and when that particular board goes high it will light up everything on the board. also when the door gets hung up you are putting more amps through the L2A circuit which is in your travel cord, you could be inducing a voltage in your car call travel wires. This can for sure happen with one of the low voltage input boards, or the dual voltage input boards that were being put out in the late 90's.
