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Unfortunately, lots of moisture and junk can get up there and kill the bulb. Remove the bulb, inspect it, inspect the connections. Make sure there is no rust and junk in there. If one bulb is working and the other is not, replace the bulb. Believe me, I have seen stranger things happen... but with one working it is not the relay or the fuse.
they have a controll module afixed to the wiper motor itself. these modules have been an issue for gm for some time. they are very simple to replace and "usually" fix the issue.
Open the hood, Turn the twist lock sleeve the surrounds the wiring harness end and pull out bulb holder. Pull out old bulb, press new bulb tab into slot, replace unit back into light housing, turn twist lock sleeve to secure to housing.
Dont touch the new bulb with your bare fingers.
Skin oils can heat up on the bulb and cause it to fail.
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