If you cannot find you information anywhere, why don't you drop by the local toyota dealership and ask them?? If they don't know off the top of their heads, they will have documentation that has this info in it somewhere. Or you could drop by a car stereo place and ask them. If you had smoke coming out of the dash, it might be worth your while to track it down and fix it. If the insulation has melted off the wire and it ever grounds out by touching some metal in your dash, you could blow a fuse or much worse. So fixing that "shitty wiring" might be a good idea.

Sean