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had the same problem, everything worked but the driver side window and door lock, I had it diagnosed at Chevy dealership and the problem was the driver door control module. the price from Chevy was around $ 775. I found the part new on eBay for $150 and had Chevy install it for $98. hope this helps
You need to see a wiring diagram to see how the ignition switch allows or sends power to that 30 amp fuse. The switch may turn on a relay (maybe the ignition relay) that sends power to the fuse panel. Or the run wire out of the switch may itself turn power on at the fuses. You may have a loose connection behind the fuse panel. Get a test light, pull the fuse, and check for power at the fuse terminals, with key on. One terminal for the fuse should have power. If not, power is lost between the ignition switch and that fuse. If it does have power, and windows still don't work, check the wire from fuse panel to the master switch-loose or poor connections, maybe a partially broken wire. If it looks good, check the ground wire for the windows. The ground wire originates at the master switch and will go back into the cabin to a nearby ground, possibly behind the left kick panel. If still no help, someone may need a volt- ohmmeter to start checking continuity of wires, voltage drops, etc.
I just answered your other question about this same issue. You need to stop replacing parts long enough to DIAGNOSE the problem so you are not creating further problems by changing all the parts on the car.
do you know what fuse links are,and what they look like? usually down at the starter,the 2 or 3 hot wires besides the main battery cable all connect they feed the power to the fuse box,ignition and accessories,they have black square rubber blocks on them usually 3 or 4 inches from the starter they are built in fuses in the wires themselves check continuity throught them,if you already know about them ,the head light switch and the ignition switch are the first place i would look ,especially if they are original
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