These Scion / Pioneer head units are a pretty popular topic of discussion around here. I just bought one myself (T1808) and the installation was very easy (plug & play), taking only 15 minutes from start to finish. It sounds great, too!
But, there's always a lot of questions about which unit does what on these Scion / Pioneer CD/iPod/WMA/Satellite radios. And there's a lot of guessing and mis-information being tossed out there.
Well, I just found a link that has the PDF file for each of the Scion radio models, so you know *exactly* which unit does what.
Scion was fiendishly clever to hide it on their own website.
Who'd have think to look there, right???
Here's the link: