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This was a common problem on all OBS vehicles, and there was a safety recall many years ago.
I had the problem about 7-8 years ago with my '97 Hoe, wipers beginning to only work sometimes, or not at all.
The usual fix is the replacement of the entire board-module on the Firewall. Often the connector plug itself was the culprit.
I got lucky, and simply unscrewed the cover with a Torx Screwdriver, cleaned both the Board, and Connectors with a Electrical Contact Cleaner Spray, re-distributed a crap load of grease to where it should've been in the first place, on the worm gears, and never had a problem since.
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