I havent pulled the head unit out but according to the installation booklet, there are two inputs for the changer: bus control in and bus auidio in. The audio input is 2xRCA (dont know if standard size) and the control input is a single plug of some form.
well it is and isn't .....it is the input for the bus control....in order to use it you have to have this box which will connect to the but control and the bus input rca's on the back of the HU...then there are rca inputs and a usb input on the box that you can plug any audio device into...