E53 Window won't go down, wiring problem (not regulator or motor problem)

[Jimmyvee]

Hi all,

I have 2005 E53 and my rear right window will not go down. I checked all the brackets, wires and assemblies and everything looks fine. No broken parts, no funny noises, nothing. I pulled the switch and tested it on the other side and it worked great. I pulled the window motor and tested that on the other side and it worked great. The motor worked forwards and backwards. I switched everything back and the motor only goes up intermittently and hardly ever goes down. I snug fit the wires in the harness but nothing seems to work. I checked all the fuses and those are all good.

How could I troubleshoot wiring problems to my rear right window? I thought it could be my GM3 but I don't have any other symptoms that would cause me to change out the GM3. Normally, there would be a lot of other problems with a bad GM3. Thanks for any help.