In Reply to: More to the problem posted by Jonathan on May 30, 1999 at 10:24:00:
Turn the key to the on position, hold one of the window switches down[front or door mounted one] and use your curled fist to lightly tap the door panel around the area of the service plug circle trim to see if it's stuck.
Both BMW and M-B had troubles in the '80s with their rear window motors "going" to sleep. Some had too much grease on the commutators and some had dead spots in the commutators but the end result is the same, no rear window function from either switch.
As far as removing the switches use a small flat blade screwdriver and gently pry the switch up, working at either end a little.
The door switches can be tricky, the panel grabs more than the center console plastic.
Other problems are loss of power or ground thru the wiring harness at the front of the rear doors.
Usually this is age related[isn't everything!] and you see a split rubber holder too when you open the door.
Some motors just die out, others can be coaxed into working forever with a occasional tap!
I keep the L/R window on my '85 735i in check with this "loving" pat every now and then but some day I might just replace the motor from sheer annoyance.
I would think about 4 new window switches for the other problems you have. The contact points can be played with but new lighted switches work longer[usually] than repaired points do on a used switch.
If you have to remove the rear door panels to verify power and ground[super easy to do] let me or Rob L. and the others here know, we stand ready to help.