what would cause all the power windows and all door locks to stop working all at

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. Each door and window has a module that can be tested. But if none are working, I would start with the driver's front switches and window motor and start performing circuit testing from there. Additionally, the use of a GM compatible diagnostic tool can be essential in troubleshooting vehicle concerns like this. Checking fuses is helpful, but - what if there are more circuit protection items in the circuit that could be in need of testing? I would continue the testing side of things and seek out why there seems to be a loss of power. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.