Center dash switch pinout

[David.Payne@brinksinc.com]

OK, I give up.  I've used up all of my early morning coffee before you
start work time trying to find some reference in my Bentley cd about the
switches that are in the center of the dash on my '89 90.  When I bought
this car almost 2 years ago, neither the front nor rear fog and rear
defogger worked (those aren't the only things that didn't work of course
but the only things that are related).  I took apart the switches, cleaned
the contacts and put it all back together with plenty of dielectric grease.
As you might expect, everything worked fine, I've had to go back and clean
the rear fog switch once and about Feb of this year the defrost quit
working.  I pulled the switch back out and cleaned it but didn't solve the
problem.  After living with it for a few months it wasn't really an issue
because of warmer weather, but now it's getting cool enough that it would
be nice if it worked.  The fuse is good and I've got a new (used) switch
out of a parts car that I could plug in, but before I get into it again I'd
like a little more knowledge of the circuit so that I can make identify
exactly what the problem is.
Anybody got any info?  Let me know....
Thanks, Dave.