As per the diagrams someone was gracious enough to let me view I took a little time to see what I could possibly check for. Not much more to test for other than power, ground, brake signal, and all four speed sensor signals could be verified. It was however a good exercise for me to gain a greater understanding of the related system components and how they are connected together. Don’t mind doing this but I wouldn’t want to repeat this exercise. A month ago I knew nothing about ABS systems and almost feared having ever having to work on one.
More to follow once I have further news to report.
(edited for clarity)