Left rear power window problem

It is quite possible with the year and miles, that there may be broken/shorting wires in the pivot area of the door, or in the door itself. First would be to check if power and ground are getting to the window motor. You would remove the panel keeping the connections intact, but disconnect the windo motor. Bridge the window motor connector with a test light and operate the switch in both directions. It should light in both directions. If it does, you have a faulty motor, which I believe is sold as a complete regulator. The click you hear is the module switching (internal relay)

You would either need to check that power and ground is coming out of the switch to the motors, or check it at the motors. Switches were known to fail on these years. Does the left rear work with it's dedicated switch?

You could apply power and ground to the motor, and it should go one way or the other depending on the polarity. The chance that you had two motors fail at the same time would be unlikely, so they would probably work. That would lead you back to having to do electrical checks of the circuits. If you have a test light and can use it, you can check first if power is getting to the motors, and if not trace it back in the circuits. I got you a schematic for reference.

Here are some guides and diagrams to help you start testing

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below)

Please let us know what you find.

Cheers

For starters, it could be a logic issue with a door module. Try disconnecting the battery cables shorting them together for a minute or so. Reconnect them and see what works. The left rear window may have issues with a connection or wire in the pivot that may explain why it won't work with the door open.

Disconnecting both, touching(shorting) them together for a minute or so. This discharges all capacitors.

Did that make any sense, and have you tried it?

Just out of curiosity, did it also correct the window that only worked with the door closed?

Still in suspense, are the windows operating correctly?

That is why I was wondering. With your original symptom, that window specifically not functioning did not apply. What I have seen in the past, is wiring that has chaffed, or a poor connection from the body harness to that door harness. There is a connector just inside the pass through grommet, that I think you could access by removing the center pillar trim panel. Disconnect and check for any sign of heat damage, and that indicates a poor connection.

Thank you.