Drivers window in pontiac montana 2002 went down and will not come back up. how do i test to see if the switch is working. The right window is functioning very well.

Most likely the window motor/regulator assembly has gone bad.Check for good fuse, if good pull out the switch and make sure you have power to it, if you do then remove door panel and test for power at motor, if u have power but motor won't work replace. Suggest replacing the regulator assembly as well because the cables often fray and cause problems as well.

Open the door & try wiggling the harness while pressing the window switch to raise the window. If the window begins to opereate, then there's a broken wire under the rubber boot holding the harness.To physically test the switch, use a 12v test light. Remove the swich assembly from the door panel & leave plugged in. With the key on, cycle the switch back & forth, watching that the light goes on & off like it should. If it works the switch is fine. I'd start checking that the motor is getting power & if so,replace the motor.