Mine is an 90 and i had the same thing, but it wasn't my my control module. My symptoms were- it didn't work sometimes, it was slow when it worked and mine even made a growling noise haha
Well for any 87-96, unscrew the antenna (optional), then pry up the little rectangle chrome cover at the base of the antenna- should be 2 screws under there, take the wiper arms off by looking at the shaft, pry out the tiny tab (should go out about 1/4 cm) while lifting as far away from the windshield as possible then let them down when the tab is out and they should not touch the window as long as the tab is out; you have to wiggle the arms off the shafts and i had trouble the first one, then i got it and the other one was easy. Then find all the screws for the windshield wiper cowl, and try to get it off, its a PITA to get off with the bottom windshield trim and hood, but i got it eventually. When u get that off you'll see the the back of the motor and i forget how the link is set up but it was simple to disconnect. By the way the wiper motor should be held on by 3 screws. Try that and see how far u get. the earliest i could get pictures is next week because mine needs replacing again, i went with a junkyard motor just because i wasn't sure and didn't want to buy a new one but this time i think I will.