I don't remember which forum I found that on. I just kept clicking related links in the link you posted and found a couple of forums in the links eventually... most of the threads were at least a year old and some were 4 yrs old so you might need a little luck to get a response.
I'm not 100% on this but I am about 99.9%.. as far as I've seen, there hasn't been any difference in wiring between the matrix/vibe and the corolla, and I've done work on quite a few in my day (wiring wise), so You can probably broaden your search and look those cars up for info too.
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