The master central locking module may be faulty. If the remote still operates the drivers side door lock and it will manually unlock with the key, it's possible the central lock mechanism in the drivers door is no longer sending a signal to all the other doors to lock/unlock. If all the door locks operate when you manually unlock the drivers door, the issue may be the remote receiver unit. It would help to know what car you're driving as some vehicles have inherent faults that are common and there is usually a go-to method of rectifying the problem.
SOURCE: 92 F150 power window and locks
try taking apart and cleanig all contacts first. make sure you are getting power to switch. Sounds more switches are going bad. They usually last about 5 to 7 years before they start going out.
SOURCE: Passenger door lock stuck
more than likely the door lock actuator is bad the multiplex unit sends a signal to the actuator to lock or unlock
SOURCE: 96 ford explorer door will not lock with switch
I do have a book on the 1996 but no on me but I have had a problem with it the same, Get in and sit in the drivers set and push lock from the in side and then do the same but this time unlock it and then get out and try to use the remote. if no then try to do the same thing but in the passenger side. lock and then unlock. no then call the ford dealer shop and they have a alarm department that will help you and I know because I had then do a job on one of my other cars and I was charged $20.00 he did it on a side job. Nikki2913
SOURCE: Remote key doesn't lock or open drivers side door
the solenoid on that door is either shot or something wrong with the wiring..possible it has a fuse for each door but doubtful
SOURCE: My 2006 Saturn Doors won't lock from the remote
Sounds like your remote reciever unit has gone bad.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
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