The passenger window won't go down but will go up with either switch. I've tried a new double master switch & a new passenger window switch with the exact same results. The motor is working when applying direct power only. When I unhook the passenger switch , the master driver switch won't put the window up , plug the passenger back in & it works again but only for going up.
This may be related to the BCM (body control module) it can be self tested to see if any faults are present.
SOURCE: 2003 pontiac montana passenger side power window
mine does that. i just pull the switch a little harder on drivers side and it works
SOURCE: Looking for wiring diagram for
You'll need to pull the door panel and check for power and ground at the 2 wire connector located near the window motor (there should be a dark blue wire and a brown wire). With a test light there should be power on one of the two wires at any time. If there is power on both wires with the switch in the up position than the switch is bad. If the only wire powered up in the up position is the dark blue wire than try tapping the motor while holding the switch in the up position. If it starts to work than the motor is bad.
On a side note check for power with all the connectors plugged in. You can also jump the connections at the motor. Supply a ground to the brown wire and supply power to the dark blue wire and the window should go up.
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