Diagnostic mode for premium stereo?

[marcus_GTS]

I remember reading about how the stock stereo has a diagnostic mode. There was a description of how to get the diagnostic mode, and an explanation of all the codes. I've looked around on this site for that info, but can't find it. Anybody know where it is?

[marcus_GTS]

I finally found what I was looking for. For those who are interested, here's the link:

http://www.celica-garage.cityslide.com/articles/article.cfm/522/984