I think I already saw a post similar to this a few weeks ago, but I can't find it now. I got my 2006 tC about a month ago, and the salesman told me that about the only thing different with the 2006 is the audio controls on the steering wheel. After looking at pictures of HUs in other people's 2006s, I noticed that mine was a little different, and it was different than the on on the CD that came with the manual, but the same as the ones shown on the CD for the xA and xB. I didn't think too much about it, until I read on here about changing the welcome message and tried to do it. The instructions for the 2006 didn't work, but the ones for the 2005 did.
I know it's probably not a huge deal at all. I doubt there's any difference in sound quality, but I did notice the one on the CD let you change the color, which I thought was kind of neat. Plus, if I paid for a 2006, I think I should get everything that's supposed to come with it, out of princible if nothing else. heh.
I think I'm gonna try to stop by a Scion dealership later today when I'm in Indy. It won't be the same one that I got it at, but I'm interested in seeing what they have to say, as well as what you guys think.
It's 1-866-70-SCION. They're really helpful. They'll probably just take down your information and tell you to try to call your dealership, and then if you still have a problem, to call back and they'll make sure you get taken care of. Seems kind of the long way about it, especially if you've already contacted your dealership and haven't gotten help, but mentioning to the dealership that you've contacted Scion seems to make things work faster. heh.