On 17, RTS automatical, in top trunk it has a USB, connect, and a cable to connect like headphones to iPhone to listen to music. I read the manual, and must be missing something. I hooked up headphone jack to phone turned on music, turned on spyder, went through display, and found nothing about auxiliary input. Could t get anything but radio to work. Does the USB cable have to be connected too ? Book is t too clear, to me anyway. Thanks