I have a 2002 civic. Since I've owned it, the rear driver side door has no power going to it. The window and door lock don't work. I am assuming the main wire that feeds power to the door's electronics may be cut, unplugged?

Before I go ahead and open up the door, just wondering if anyone has a more simple explanation?

Thanks.

 

I had a problem with both rear windows not rolling down. Almost like the "child lock" button was down but it wasn't. The doors locked for me but it may be related to the same thing for you. I watched this video to learn how to take the door panel off. Very easy to do...

There was a wire connected near the very middle of the door running vertically. Had a plastic tab to keep it in place. Disconnecting and cleaning the connectors worked for me. Both rear windows worked just by jiggling it but cleaning it out kept the problem from coming back. Hope it's something simple like this for you.
Just take everything apart and reconnect the window button only, with the keys in accessory mode, for testing then start wiggling wires while holding the window down/up button.