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Patents aren't everything though:

From ToyoDIY: December 6, 2009 The diagrams are no longer available on this site per demands of Toyota Motor Sales Inc.

Yes, they still have part number listings/search (which is awesome), but they did use to have more.

This site has extracted the databases of the "Toyota EPC" application and put them on the internet with a web usable UI.

If you want this material, one place I know you can find it is rutracker and you should simply search for "Toyota EPC."

A site called 'realoem' did the same thing with BMW's database, and seems to have had no trouble for the years that it's been online.