Okay, after much more searching, I found this schematic. The PDF file name says it's for a 2012 4Runner, so hopefully it really is and it is the same as my 2017 Pro.
Okay, just eating a little humble pie here and exposing my newbie-ness.
The "Modifications, Write-Ups, Quick-Links and FAQ's" sticky thread has a link to "TIS FSM for 2010 4Runner" and in that there is a downloadable file with all the 2010 schematics. If you're like me and don't know what the hell TIS FSM is, you can find a bunch of downloadable files there including a repair manual.