The rear windows opened on their own and won't close. According to the manual these are power windows, but I cannot find a switch. Any suggestions? Thank you!

Owner's Manual page 2-26 : http://www.vadengmpp.com/owners-manual/pontiac/2004-Pontiac-Montana.pdf

This switch, located in the overhead console switchbank, is used for opening and closing the power rear quarter windows. Press the textured part of the switch to open the windows; both windows will open. The windows will continue to open as long as the switch is pressed, until they are fully opened. Press the part of the switch with the symbol to close both windows. The windows can be closed fully or partially, depending on how long the switch is pressed.

see the diagram and troublershooting and fix it. God bless you

power locks, power window and power mirror not working
http://howtobyme.blogspot.com/2011/09/power-locks-power-window-and-power.html
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These will help.
Thanks.

Either the master switch or a partial open in the wires in the hinge area.

the motor in the drivers door is probably bad. check to make sure it has power and ground with a test light at the motor with the wires unpluged.

check trunk fuse

it may need to be reset.

SECTION 501-11: Glass, Frames and Mechanisms 2001 Explorer Sport/Sport-Trac Workshop Manual
GENERAL PROCEDURES Rear Window Motor Initialization CAUTION: Make sure that no obstructions are present in the power rear window system when carrying out this procedure.
NOTE: This procedure must be carried out when repairs are performed on any part of the power rear window system including when: the power rear window motor is removed from the window regulator drum housing, a new power rear motor is installed, a new power rear window regulator is installed, a new power rear window module is installed, and any operation in which grease or lubricants are applied to the power rear window system.
NOTE: All power rear window components (window glass module, window regulator, window motor, and glass runs) must be installed and torqued to specification before carrying out this procedure.
NOTE: Steps 1-6 must be completed within 30 seconds. The entire procedure must be completed within five minutes.
NOTE: Once the ignition key is turned to the ON position in Step 6, it must remain on until the entire procedure is completed.
NOTE: Steps 7 and 9 require that the power rear window control switch be held in the closed position until the power rear window motor stalls the window in the upper header seal. Step 8 requires that the window control switch be momentarily turned to the open position.

1. Start with the ignition in the OFF position.

1. Turn the ignition to the ON position.

1. Press the power rear window control switch vent button six times.

1. Turn the ignition to the OFF position.

1. Press the power rear window control switch vent button six times.

1. Turn the ignition to the ON position. The power rear window will move up-down-up-down approximately 20 mm (0.8 in). This movement indicates that the power rear window motor has entered initialized mode.

1. Rotate and hold the power rear window control switch to the closed position until the window stalls in the upper header seal.

1. Momentarily rotate the power rear window control switch to the open position and release. The power rear window will carry out a one-touch down operation until the window stalls at the bottom of the travel stop designed into the window regulator.

1. Rotate and hold the power rear window control switch to the closed position until the window stalls into the upper header seal. Once this operation is complete, the window will move up-down-up-down approximately 20 mm (0.8 in). This movement indicates that the power rear window motor has been successfully initialized.

1. Verify correct operation of the power rear window by moving the window to the fully open, vent, then fully closed positions.

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• The power rear window is inoperative (Explorer Sport Trac only)

• Circuitry.
• Battery Junction Box (BJB) fuse 3 (30A).
• Central Junction Box (CJB) fuse 20 (7.5A).
• Power rear window control switch.
• Rear window glass motor.

• Go To Pinpoint Test K .

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sounds more like the wiring in drivers door faulty- worked to open after you changed it - but won't close it now- remove door panel- unplug and replug switch and try it- could be as simple as that

See page 64 of manual...open and close rear window using rear door's window switch. It will reset the driver's door master, which will work as it should.