I'm posting this as a solution in case it is helpful for someone because it was bear to figure out. Rear wiper was not working and made a humming or buzzing noise. Almost like a bad motor. Fuses and switch ok. Took motor out, looked okay but ruled out everything else so I got a wrecking yard...
so I was trying to change the rear wiper but the nut is so rusted on it spun the shaft, so I tired to pop the rear glass to get to the rest of my tools and it won't pop open, removed the interior panel and checked voltages and continuity and they're both good, I dont. know which is the signal...
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