I have a 1999 lexus rx 300 without cd changer. I bought a CD/DVD player (DUAL) which I would like to install. I would like to keep the original radio intact. I want to findout if my car has the cd changer wiring, even though the car had never had a cd changer. I would also want to know if there is a way I can connect the cd player with the wiring of the cd changer.