Pontiac Problems? Ask a Mechanic for Answers ASAP
One place you may want to have a look at the wiring is in the harness coming from the body to the drivers door in the door jam harness. Its one area where there have been know issue withbroken wires as well.
The door locks and windows are on different circuits so it is still possible the problem is in the door jam wiring and W would sure have a look. See if you have power and ground at the master switch.
Give me a moment to look at the switch wiring diagram. The power windows get the signal from the door module , have you scanned the system and retrieved the fault code that should be setting when the windows do not work?
Well I can send you the steps for the common test for the DDM, See the test in the link below, copy and paste it to your browser to open and view them. Unfortunately with out being able to scan the system it makes it pretty hard to do the diagnostic steps.https://dl.dropboxusercontent.com/u/104923897/Power%20window%20test%20Aug%207.pdf