If the power door locks quit working on a 1979 Corvette, it is due to broken pigtail switches. With age and use, the pigtails break and leaves the power door locks inoperable.
The power steering pump on an automobile will not air lock. If the power steering is not working properly, it could be that the pump itself is in need of repair. Replacing the power steering belt might also fix this problem. Also check to make sure the pump has enough fluid to operate properly.
The expedition door lock relay could be stuck causing the grinding noise. Check to insure that the lock relay is working properly.
Check your fuses.
Check the fuse and relay.
Check the fuses.
The rear actuators may be working, but the locks themselves may be corroded and in need of opening the door up and spraying them generously with penetrant.
The first cars like the Stanley Steamer had mechanical door locks. The first car with power locks was a luxury car called the Scripps-Booth in 1914. It is unclear through most references which engineer working on the Scripps invented the power lock. Power locks were popularized by Packard luxury automobile Co in 1956. It is unclear through most references as to which engineers working for Packard invented their power locks.
The power door locks on a Dodge Caravan can stop working if the fuse is bad. Check the power door lock relay fuse that is located in the engine compartment on most Dodge Caravans. It should be next to the battery.
No
Same problem, but didn't replace the dome light.The locks will unlock but not lock.
burnt fuses