JVC car receiver won't play iphone music through usb?

I bought a jvc detachable face receiver for my truck and it will not play any of my music. It shows the track, the album artwork and the duration but it WLL NOT make a sound. Is there something i need to change on the settings? ( I have an iphone 5 but I've tried it with an iphone 4 and an iPod)

Never had a radio with the usb before but I do know you can run what your trying to pull off through the rcas if your not to concerned about how your music is delivered try hooking it up that way unless you like the idea of using the usb

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