All windows quit working No power to master power window switch. 40 amp fuse and 15 amp fuse have power. I get 12 volts from one spot on the relay. Can someone please tell me the wiring circuit. It starts with battery then 40 amp curuit breaker then what? Where does the body control module fit into the circuit? And has anyone ever heard of just the power window part of the BCM giving out? Why don't I have power to the master window switch?