There statements you made, regarding the first one i asked you what you based that statement on, and realy the same for the second one, do you do much vehicle diagnostics?
Any diagnostics are unfortunatly not my field, sorry, I employ laptop techies for that.
Perhaps garages should do the same if they have problems with vehicle electronics.
And my statements are base on what I have seen and heard over the years as a qualified electrical engineer, and that statement is my final one as this thread will go on and on and get nowhere.