I'm not positive, but based on the size of N10 (from the pictures), I'm guessing it has a number of relays/electronics in it... not a single relay. So, failure of one would not necessarily affect other circuits. Some of the techs here may know.
I'm afraid I don't have access to the info you seek on your '93 SEL. I've only researched and gathered info on the '96 S Class cuz that's what I have... sorry.
Anybody know?
KenP