The Body Control Module may fail causing the power windows to stop working and other various electrical system faults.Google+
Car Problem Reports
Pontiac Aztek Power windows may not work due to faulty body control module
Pontiac Aztek Problem
Average Mileage: 126,000 mi (112,000 mi - 140,000 mi)
Visitor, 2001 Pontiac Aztek, 140,000 mi
BCM (Body Control Module) failed, causing ALL interior and exterior lights to turn on and off at random....also caused intermitant failure of power windows, power doorlocks, radio, rear hatch realease, gauges.
Visitor, 2003 Pontiac Aztek, 112,000 mi
Same issue, all the power windows and sun roof stopped working at once.