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I know there are many threads on the wiper issues. I'm more of a thread reader than a poster or responder. I'm always concerned that someone has already posted the same question and I didn't perform the correct searches. So here it goes...
I had the wipers turning on and squirters running all by themselves. I found how to remove the circuit board and carefully clean the circuit board of corrosion. I applied dielectric grease and used RTV to seal the circuit board when re-assembling. Wipers and squirters have worked fine now for months. The only issue I have is when I turn the wipers off, they dont return completely to the park or horizontal position. They stay up a few inches. When I turn the wipers on, they momentary drop down and start the sweeping pattern to clean the windshield. I finally broke down and ordered a new circuit board from my local GM dealer ($80) and he stated this should fix my very common problem. Needless to say, after swapping in the new circuit board, I have the same result. The wipers still dont return to the horizontal (park position) completely. They used to park fine until I open the circuit board the first time to resolve the corrosion / water leaking issue in the circuit board.
I read in another post to unhook the battery and maybe this would reset something.... but it didn't help. I appreciate any helpful replies.
Eric - 2003 H2 with 49,000 miles
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The wiper moter assm must be replaced, there is a GM TSB about this on the 2003 H2. Mine did the same and the change out worked great. This problem is with many Hummer H2's over the years, even my 2008 did the same. Thats what you get for using a wiper moter from a Saturn in a Hummer H2!