Why won't my iPhone play music through my car?

I have a 2011 hyundai genesis and there's a USB port. I have tried two different cords and four different iPhones and all of them had the same result. The iPhone says trust this computer then goes away faster then I can press anything. After doing this multiple times, the screen on the car will say reading error. Any idea why this is happening?

Simple you have the wrong cable, you can't use just any USB cable in a Hyundai radio,
you need the original cable

http://www.oemautosound.com/p-430-kia-ipod-cable.aspx

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