I added a picture of the diagram (red box) showing the CAN bus connector.
As far as I know there is no failsafe for the failsafe. All your eggs are in one basket. I suppose, but do not know, if failsafe failed one could strong arm the steering wheel to steer the car/truck over to the side of the road...if you have your wits about you. Unfortunately the little old lady with arthritis may find it a problem. I don't know if it would pass DMV regulations or if you can convince your insurance company it was safe. All I can do is raise warnings in hopes of being helpful for the unforeseen.
I do have experience in replacing a gear box, with multiple gears, with individual position-control motors that are controlled by a PLC.
Why does the EPS need to know that brakes have been applied? Doesn't the question prove the point I was trying to make about technology?
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."