The description sounds like a data problem on the computer network from the comfort control module. That system is a convoluted one. The local door switches are not actually connected to the motors in the doors. Instead they are nothing but data inputs, when you push one down it sends a signal to the comfort control module requesting it lowers or raises the chosen window. The thing with a bad data stream is that it could be any of the modules in the doors or the CCM itself.
What you might try to isolate front or rear modules would be to remove the power from them, First try pulling fuses 2 and 23. Those are the power feeds to the rear windows. Did both front windows start working at both switches? If yes then the issue is likely in one of the rear modules and could be isolated by disconnecting one side and putting the fuses back in and seeing if the three windows left now work at both switches. If they do you know the one you unplugged is the bad one, if they stop working then the one you left plugged in is likely the issue. The front modules can be tested almost the same way. If testing the rears shows no changes, unplug the passenger door module. Do the rear switches now work? If yes the passenger module is likely at fault. If not then it is likely the drivers module.
If you have a scan tool that can talk to the system you can make this much faster as it would show the individual control signals and you could just look for the one stuck in the up or down position. One of the major issues with modern vehicles is how everything is interconnected, the older power window systems were much simpler because they didn't have all of the systems interconnected. In this case it could be that a faulty door handle or lock is causing a signal that is stopping the windows from working.
Thursday, October 22nd, 2020 AT 9:59 AM
