Hi,
Since nothing is working on the left rear door, we need to confirm there is power getting to the left rear door module. First, if the right rear door is working, then it isn't a fuse because both doors get power from the same fuse. So, remove the door panel and locate the door module. Disconnect the door module and locate the orange wire to it. That wire should have power.
Check that first. If there is no power, we will need to trace that wire back to fuse which is in the fuse box under the left rear seat.
Here is a link you may find helpful.
https://www.2carpros.com/articles/how-to-check-wiring
I attached the schematics for the lock system. Power for the door module is for both the locks and window.
Let me know what you find.
Joe
See pics below I highlighted the wire from the fuse to the module.
Images (Click to make bigger)
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Saturday, July 31st, 2021 AT 9:58 PM