Has anyone got the cable connection to work with a 4S? I have the same issue, the head unit displays my entire library and it appears like its playing but I don't get any sound??? Seems strange to have to plug in the aux adapter to the headphone output, as my other vehicles just the 30pin adapter is all that's required. On a good note I was able to get the Bluetooth connection to work, but sometimes I like to have it plugged in to charge while playing.