When I bought the car, the system was prewired to the amp but no unit. I added the factory unit and had this guy at the shop tap into the wires to for RCA inputs. When it was done, everything worked normally except the cd player. The cd was playing but no sound was coming out so he added another switch. So everytime i wanted to listen to the cd player, i had to turn that switch on. The problem is sometimes when i forget to turn to switch off while listening to the radio, the radio won't turn off even when i turn my car off. Is there a way i can have the cd player working normally without that switch so the radio turns off when i turn my car off?