Just figured this one out the hard way a few weeks ago on my 268 Vista (same Clarion head unit as yours). There are 3 sets of RCA plugs on the back of this unit and only one feeds the Aux input. The others are amp pre-out and something else, I never could find a concise breakdown of what each does. I ended up reconnecting my iPod adapter to (I think) the set of plugs with the red wiring (one set is gray, one set is red, the other black) to get the aux in input. Also I had to change the input level in the menus to high in order to get it to pick it up. That's the crucial step, otherwise the pre-amp set of plugs is the only set that will play any sound if you are using the "plug and listen" method. Mine would only play through the front speakers and I had no volume control from the head unit itself, but setting the volume to 0 would kill it completely, go figure. After connecting to the right set of plugs and fixing input level, everything worked great!
A quick google on the model should get you some more specific info as to adjusting the input level, without the unit in front of me I can't remember which button gets you to that particular menu.
Hope this helps!
_________________ Jack 2005 268 Vista - Sold
2001 Silverton 35C 8.1L Crusaders
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