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To make sure I understand what you did - I think you're saying that when you switched motors the window still did not go up/down properly when a switch is activated. I'm suggesting you apply 12 volt current to the motor directly (independent of any switch). If you find the motor goes up and down properly when wired directly, then consider the GM3 module likely has a bad relay in it as the source of your problem.
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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife
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