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If both of you have done the following:
1. swapped another window switch
2. reversed the wires to the motor can get the motor to go up by reversing wires
3. swapped master switches
and the symptoms are still the same then you must have a problem with either:
a) the wiring between the switch and the b-pillar connector
b) the wiring between the b-pillar and fuse box.
Easy option, pick up a rear door wire harness and test it out without installing inside door to find eliminate that wire harness.
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