Hyundai Elantra Touring won't recognize my iPhone?

I plug my iPhone or iPod touch into Apple's cord, then into the USB slot in my 2010 Elantra Touring. It will alternate what it displays: for a split second, it says that is it charging, then it says it's not connected, then back to charging. I don't know what the problem is. I want to play my iPhone music on the Hyundai's sound system, and easily charge it too. Any suggestions/advice?

Have the dealer check it.

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