I started having intermittent problems with my windshield wipers not working today. Washer fluid, also.
After a Google search, I found that a circuit board in the wiper motor assembly might be the problem. However, I did not see any references to the '91's having this board. Can any one confirm that it does?
Also, if this helps to narrow the problem down- when I tried the wipers or fluid, I heard a 'buzz' that sounded as if it were coming from the under/behind the dash. It is possible I heard it through the firewall.