Electrical problem
1999 Chevy Tahoe V8 Four Wheel Drive Automatic
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What could it be that makes the door lock stop working? It seams like a fuse that blew but I can not find one. The door locks just stop working one day and can not find out why, I did look for a fuse, however I did not find the door lock fuse. My question it where do I find the fues, if it has one, and how do I trouble shoot it? No remote for it also, just a door key

Thank you
Unhappy Bob