 2003 Mustang Factory Radio
Does anyone know if the factory radio in a 2003 Mustang has support for an external CD changer? There's a couple plugs on the back of the radio, one of which is a 20-pin plug where I'm fairly sure the cd changer would go. The thing is, I can't really find any button on my radio to switch to the cd changer input. I should be able to toggle between radio, cd, and cd changer, and if there was nothing hooked up to that plug it would say "No device attached" or something like that.
So my question is, does anyone know if the factory radio in a 2003 mustang has support for input from the 20-pin cd changer plug? And if so, how do I toggle it? | 
