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Discussion Starter · #1 ·
I have an 06 Colorado LS 4cyl that had the wipers go from functioning fine to only working on high speed.

That happened for about a week, and then the wipers suddenly started turning on immediately when the truck started, and would go off if 1) I stepped on the brake, or 2) put it in gear.

I just changed the wiper motor on advice from a GM mechanic, and there was no change.

Still turn on when I start the truck, go off when I step on the brakes or put the truck in gear, and only work on high.

What's next?
 

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Clean the fender apron ground packs mounting surfaces. Search ground packs here. I can't recall if the wiper motor is grounded at it's mounting or not. You would know maybe they are dirty grounds there. From what I understand the BCM controls the wiper operation.
 
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