Digging up a old post here.
My wipers had all the problems listed here on this site yesterday and till today except the washer spraying till empty, when I took matters in my own hands tonight.
Pulled the module apart to find exactly what HUMTECH said would most likely be the cause, WATER.
I took the ole trusty air hose, blew the water out. Took some contact cleaner to the circuit board, then added black RTV sealer to the existing foam seal, put it all back together and presto the wipers work as before. Cost, just some of my free time to find out how things work.
Just in case others want to take the time to fix something themselves.
Later, Easy Ed
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