My 2009 Azera LTD w/NAV didn't come with an AUX IN (something that Hyundai just didn't do with NAV radios that year I guess :/)

I don't need the factory XM service so I was wondering if I could take the L/R audio input into the head and make that into an AUX IN jack (so I could plug in an iPod or a PNP satellite radio.)

Anyone have any thoughts on that idea? If so, could you sketch out a wiring diagram for it?

Thanks!