Hi M.B.DOC, thanks for helping out, where are the door modules located?

I just called the dealership and asked to get pricing for the modules (I thought that they were located in each door) and didn't know what I was talking about. They told me that it's either the switch or the motor! I figured I can try to replace them if they are cheap.

Can you provide some information on how to troubleshoot it? I am an electrical engineer, I should be able to do it if I know what I should be looking for.

Thank you very much!