Buick regal door locks not working correct

Try lubricating the door latch mechanisms on all the doors.

Door lock solenoids are connected to the door lock by linkage inside the door. That's the best place for them. You have to remove the door handle and window crank then remove the door panel to get to it.

need to remove the door panel and check the clips that connect to the locking rods possiblr damaged or disconnected

Remove the door panel and unplug the connector to the door actuator. Probe the contacts with a voltmeter set on DC volts. Then operate the lock/unlock switch. You should see the voltage toggle from +12 volts to -12 volts. If you do, then the wiring, switch and connector are good and you have a bad actuator. Be prepared to start replacing all of them because they all operate the same number of cycles.

could be that one of the rods inside the door has shifted to where it is not allowing it to unlock, sounds like its just jammed. I would remove the inside door panel if you can and look at the rods leading to the lock and the door handle see if they need to be freed if so after freeing them grease them real well with any kind of gear grease so it wont happen again.

did you try changing the master switch(controls all windows and locks)? i would hook it back up to the way it was and change that master switch

Your vehicle is designed to auto lock the doors when you reach about 15 mph. This is a one way deal. When you park the car, unlocking the doors becomes a manual process to insure the occupants safety at their destination.

The only way to really see the problem is by removing the door trim panel. This will allow you to see if is the actuator is moving, and how far, along with noting any interference of lock linkage movement. Hope this helps.

I had they same problem a few years back. Aging electronic circuits may be the issue here. That is what happened to cause the remote door feature to operate intermittently in my 1991 Buick Regal. Over time the heat of summer and the cold in winter stress solder joints on printed circuit boards. That stress can bring about what is known as cold solder joints.

I located the remote door receiver module behind the back seat under the cover that holds the Third Brake Light. Once removed from the car I opened the module up and inspected the printed circuit. Sure enough I saw the problem using a magnifying glass. Many of the solder points had cracks around connectors, resistors, capacitors to name a few. Resoldering each bad point sovled the intermittent operation. I hope this helps...

They are right at the GM dealer, u need a new module, have seen and fixed this very issue, have the dealer do a national inventory search both in Canada and the USA, if the dealer won't, call a US dealer and ask them to try and get the part for U, have done this more than once for out of production parts, always got the part from somewhere.