I found out that when you hook the factory unit with an amp, there's no 'remote' signal to go to the amp so it's tapped from the antenna. The problem is when i listen to the cd player, there's no power coming from the antenna because it's not used. As a result the cd player is playing but the amp is not on. That's why the guy at the shop added a switch to turn on the amp when i listen to the cd player. So is there another way to get the amp to turn on when my radio turns on without using that switch. I don't mind using the switch but when it keeps the radio on after my car is turned off, i might 4get about it one day and leave the radio on all night. So does anyone know how to make my system work without using that button.