Door Module or Central Module, need help!

[Dusty Doug]

My RF door window stopped working the other day, the motor was just making a slight groaning noise. I jumped power to the motor and it is fine? I suspect low voltage to the motor to be the problem.
When trying to diagnose the motor/window problem the module goes into protection and shuts the door off completely.
I see in the manual there are two modules that control the door, any advise as to how to diagnose the condition without a DTC Scanner or if it is the General Control Module or the Door Module?

[mywidebody02]

the drivers side module controls everything. might want to measure the output voltage from there and check the connections.

[645i]

Its not the GMC. If it was that ,normally alot of other things in the car would start flipping out at the same time not just RF door. You have a short that is causing a voltage drop between the L door to the R door, or that motor could be giving out