[Brian in Tucson]

Check for a weak fob battery, they're cheap so just go ahead and replace it.

On my 01, door locks didn't work til I replaced the window regulators, then, amazingly!, the functions came back. Does the dash switch lock and unlock the doors? Have you reactivated the locking system by manually locking the door with the key? (Do this with the driver's window all the way down so you can reach in & pull the door handle if the system doesn't want to unlock.)

The electric systems, to say the least, are puzzles and enigmatic. One thing after another is coming back to life. It's almost like the poor little car is thanking me for taking it away from its previous owner. (And I'm showering it with $100 bills and lots of love!)