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I am sorry that you have not been helped yet. I just came online and saw your question
To make sure I understand correctly, the switches for the front doors work fine but the rear window switches do not work, or do they only work at times?
Did they quit working at the exact same time, or did they fail at different times
I also need the vin number to pull up the wiring schematics
Ok, it sounds like that master switch is faulty on the driver door, left rear and right rear door circuits. Give me a few minutes to pull the schematics and verify