anybody else have a problem when you have something plugged in the cigarette lighter the NAV screen gets all scrambled? i couldn't figure out why it was so messed up looking until i unplugged my phone charger. I couldn't plug it into the aux power in the console because my Ipod is hooked up there.

 

I think someone else had a similar problem, and it had to do with the wiring behind the audio controls getting messed up. Since you have an iPod attachment, does this mean that you had to tinker behind the panel? It might be a starting place to look.