Hi, I recently purchased a used 2009 volkswagen jetta city that comes with the USB auxilliary input for hooking up your ipod. The car's in great working condition no complaints there, but I wanted to see if the USB input would work. So I tried using my apple's USB cable to hook my Ipod touch up to the system, but it keeps giving me an Error 04 message, like it can't be read or something. Any suggestions?

Thanks!