Please take your computer and sit in the front seat, my crystal ball is kinda fuzzy from this angle.
In all seriousness, I have attached and pdf for you to check out the door lock system. There is no 1 thing that is common that goes bad. You need to inspect the system and diagnos from there.
Check all fuses/relays and Fuseable links. There is a pink 30amp fuse link that feeds power to the door locks, located in the inside fuse box on the drivers side. I would start there and make sure it is good. It feeds power to the high amp door lock actuators from the door lock relay.
I have also attched a door lock wire schematic for help to trace down wires and check the fuses and ground locations.
Hope this helps