B6 Passat RCD500 and iPod Cable

[Throbbinhood]

Hey everyone,

I've recently got a B6 Passat, it has the RCD500 (silver buttons) and has an iPod cable in the glovebox that appears to connect to the back of the radio. For the life of me, I can't get it to work with my old iPod Nano.

I've tried the CD button twice, and all I get on the screen is 'No CDC'.

Any help?

[Throbbinhood]

To add to the confusion - there appears to be a small microphone with cable that goes into the back of the dash somewhere. I don't think it's factory??