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.
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