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The first, and simplest, thing to eliminate is a possible malfunction of the switch itself. Swap the passenger side window switch with the driver's side window switch and see if the problem follows the switch. Conversely, you could take the driver's side switch and install it into the passenger side position and see it the window now goes up.
That would be my first step in troubleshooting this problem, and proceed from there.
Also, because the windows are controlled through the immobilizer, I would check for any moisture or water behind and under the driver's seat.
Regards, Maurice.
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