Continuity The best way to start troubleshooting would be to check for continuity at the switch. If you have battery power coming in, you next check the leads running from the switch to the mirror and window motor.
If you have power to the motors, then the motors are bad.
If you DON't have power coming out of the switch, the switch is bad.
If you don't have battery power to the switch, double check the correct fuses, then start tracing that wiring back in the harness. Sometimes the harness gets damaged where it leaves the body and jumps across to the door.
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