Just found a schematic.
Are you able to swap out the passenger side switch with the driver's window switch?
As the driver's side switch for the passenger window is used at rest to supply power to the passenger side switch, both switches need to work to allow operation. You have tested both switches on the driver's door but seemingly not the switch on the passenger door.
It looks as though the breakers for the driver's side are in the positive line but those on the passenger side are on the negative line.
With all switches at rest it looks as though both motors have +12V on both wires relative to ground.
Let us know if you are still struggling and I will try to do diagrams showing current path for each option of switch operation.
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