The back passenger's side window will not go up.
It sounds like either the window motor or regulator has failed. When the window switch is pressed, power is sent to a DC motor. The motor is attached to a scissor-type device called the regulator, which lifts the window up and down. A certified technician, such as one from YourMechanic, will be able to remove the door panel to determine what is causing your window trouble. From there, they will be able to perform the repairs to get your window functioning like normal again.
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