1999 gmc jimmy power windows locks mirrors wont work

If none of the mirrors or locks work, then you will very likely find a blown MIR/LCK Fuse #7 (10 Amp) in the underhood fuse block. If this is the case, you need to find out WHY the fuse blew because if you simply replace it, it will most likely do it again. Otherwise, the locks and mirrors also connect to the Body Control Module (BCM). I would recommend scanning the BCM for fault codes.

The windows are a completely separate circuit. They have nothing in common with the mirrors or locks other than than that they all ultimately get power from the battery and the circuits run through the umbilicals that go between the body and the doors.

If none of the windows are working, the most likely cause is an open power circuit or open ground circuit at the driver's door. This could be either a bad master control switch or is could be that the wires inside the umbilical are broken (fairly common).