Check the fuse.
Check fuse
Loose wire?
it is a switch problem most likely if door and window use same fuse then try the switch itself for the locks
There are many electrical and mechanical conditions that cause the door locks to become inoperable on 1999 Pontiac/Chevrolet F-Bodies. A common failure is that the door locks, window motors and radio will all become inoperable simultaneously for a few moments. If this is the condition it usually signifies failure of the body control module (BCM), which is located behind the glove compartment door.
Are they totally non-functional, or just not functioning from the buttons just ahead of the doors on the door pillar? they wont open
replace rear door shocks. the two rods along the sides.
why dont my 2001 windstar van lx door locks wont lock
most likely that would be a fuse
If there are no blown fuses in your Lincoln ls, then there could be a short in the wires causing your power locks to not work.
I had all four of my door locks stop working. I was told it was the actuators and for $250.00 per actuator (my only local Ford dealership) I could have them fixed. Back to manual for me.
Start by checking the fuse.