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Welcome, I'm Chris (aka Moose).
Do you have a volt/ohm meter so we can do some testing?
Here are the wire diagram for this model https://www.dropbox.com/s/tq4wiq16fc79mtb/civicwin.pdf?dl=0
We need to make sure the main switch is sending out ground on the brown and brown/white wires to the left rear switch when neither are being used. If so then see which is not grounded at the LR switch, most likely it is a broken wire in the harness in one of the door jams.
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