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I found out what is going on with the window controls. I completely forgot all about the LIN-bus...
(pg 69 - E90 GENERAL VEHICLE ELECTRICAL.pdf)
"1. The signal is routed via the LIN-bus to the footwell module when the power window
switch for the window in the driver's door or front passenger's door is operated. The
footwell module drives the corresponding power window motor.
2. The signal is routed from the driver's door switch cluster via the LIN-bus to the footwell
module when the power window switches for the windows in the rear doors are operated.
The FRM sends the signal via the K-CAN to the JBE.
On receiving the signal, the Junction Box Electronics Control Module activates the corresponding
power window motor."
So simply(?) its:
Switch -> LINBUS -> FRM -> KCAN -> JBE -> KCAN -> Window motor
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