Help from Denon DCT-100 users

I'm trying to connect my iPod classic to the aux. input of the HU. I got a rca to 3.5 cable and connected the iPod to the HU, changed the input mode to aux. on the HU and nothing happens. I can't find a owners manual for the Denon online, except in Japanese. I did find a manual for a Rockford RFX-8250, which was made by Denon. The manual is not very detailed and doesn't talk much about the aux feature at all. It did mention something about when using the aux. feature you must connect a brown wire. Doesn't say what to connect it to though. Any help is appreciated.

Does your Denon say aux on the lcd screen?

Yes. When you hold the mute button down for a few seconds, that's what activates the aux mode and it has aux on the screen.