According to the wiring diagrams, driver's and passenger power fold mirrors each have their own module (I think window switch) which communicate via a bus with the GM module. haha I wasn't typing fast enough! 
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
Last edited by 80stech; 11-24-2018 at 12:14 AM.
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