The intermittent power window module for your 1996 Chevy Lumina can be found inside of the driver door. You will need to remove the door panel in order to access the power window module.
== Rear Power Windows Only Work On and Off== Sounds like a precursor to either a switch failure or window controller failure. I had a Nissan that started out like that ....intermittent until finally all four window controllers became inoperative one at a time.
Change your wiper inserts.
At the Pontiac dealership or eBay just type in Pontiac sash
How do yo fix a stuck driver side electric window on a 1998 pontiac firebird.
If it looks the same it will probably work.
The most common problem is a failure in the gears in the window motor. eBay has many vendors for the parts or any auto parts store can get them.
with a window crank removal tool.
change the window regulator
on the rear window
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You can find a power window wiring diagram for your 1977 through 1979 Pontiac Trans Am in Pontiac service manuals. The service manuals can be found at most local libraries.