Electric windows are 12V DC motors. They reverse by changing
the polarity of the current from + to - via the switch through the
motor. Check the drivers side first. Check the rubber boot
between the door and the jamb where the wires pass for
damaged wires. If there does not appear to be any damage,
you'll need a multi-meter to check the main door switch on the
drivers side. Check the net. There are probably a ton of videos
showing you "how to". You probably do not have a color coded
wiring diagram so the testing procedure will take a while-while
you figure out the combinations.