Good to see you over here.
Not sure about a diagram or what your looking for, but here
http://www.subaru-svx.net/forum/showthread.php?t=51702 is a very long thread where many of the SVX elite weighed in on the coolant system. The entire system is taken apart in detail in that thread.
And I've never seen an electronic version of the OEM FSM, but there a few links in peoples signatures to a generic version of the SM.