2004 Tahoe Door Key Lock Not Working

The door locks on my 1999 tahoe stopped working and i checked the fuse which was fine.
2004 tahoe door key lock not working. I don t think i ve ever used the key so i can t say if its ever worked. The door locks on my 1999 tahoe stopped working and i checked the fuse which was fine. The problem turned out to be that the fuse for my cigarette lighter was bad and for some reason it also must be working in order for the door locks to work. I sprayed a ton of wd 40 inside the keyhole took off the door panel as well as the plug at the side of the door and sprayed everywhere else that i could think of.
I got the same problem with my 99 tahoe. For vehicles equipped with door lock cylinders the door can still be opened using the key. Put in a new cigarette lighter fuse and the door locks worked again. Put in a new cigarette lighter fuse and the door locks worked again.
Anyways my question is about the key not working in the door lock. For vehicles with traditional style door lock cylinders and keys a bad power door lock relay will merely disable the power door lock feature. However vehicles without door lock cylinders will not be able to lock or unlock the doors until power is restored. The problem turned out to be that the fuse for my cigarette lighter was bad and for some reason it also must be working in order for the door locks to work.
If your rear speakers aren t working in additon to the lumbar button on the side of the seat it s the fuse 13 i think.