New owner 2009 S question concerning usb plug in (option not included)

Title says it all. I'm a new owner of a 2009 Cayenne S, HELLO, and I've really gotten used to playing music from a USB in my other cars.
The Cayenne does not have one included as it was an option in 2009, as I understand it.
I would really like to add a USB plug in and my question is, was the wiring for the USB included in the harness, from the factory or would I need to buy a separate cable to string through the console to the PCM ? There are USB/AUX factory units available. Thanks.