I did some looking and I suspect that to get one you would have to create it yourself.
Can't find any info on those anywhere, other than on the various forums.
Nothing near what you ask for.
Good luck.
There isn't much point of having a schematic, because a Valet controller is hand-wired with soldered connections, and it all is visible. When a motor burns out, you would not be able to get your hands on a replacement for less than a hundred dollars.