is it possible that connecting the rear light eliminator plug caused a fuse to blow, nothing else that you did to it should have caused all these errors. .
another possibility is that during subrame change a wire or two was pinched and has shorted to chassis, check all of your wires for pinching and insulation damage
, this would lead to blown fuses or high resistance situations that would causes error codes like Daniel stated
Yes could be!, was thinking that it could perhaps be the wrong plug?, it is called 96510961A.
I also have a rain light kit from Jetprime, but did not try it due to the new rear end.