There could be many problems in this situation. Here is a list of some things to check:
1.) Check the wire connection in the door jamb where the wires transfer from the vehicle to the door. Sometimes these connections get a little off and things start acting goofy because the door being open and closed all the time(nothings perfectly designed).
2.) Check the relays in the fuse box, I can't remember if on this model vehicle if they used separate relays for each door or just one for all of them, but the relay could be bad.
3.) Check the locking mechanism inside the door by taking off the door panel and using a multi-meter and a 9 volt battery. I've checked the locking mechanism inside doors with a 9 volt battery before to make sure the mechanism was able to do it's job without being hooked up to the vehicle's power source
SOURCE: 2005 buick lacrosse
lock rod has probably come off from door lock, try to get inside panel off or have someone with slim jim try and reach the rod to unlock the door
SOURCE: keys locked in car
use a wedge to wedge the door open a lital bit on top and use a strait peice of metal that can bend fairly easy to go down inside of the car and hit the unlock button. or call a tow truck company and they will come out to help for $40 or $50
SOURCE: 2000 Buick Lesbre - Intermittant electrical: Door
THE PROBLEM SOUNDS LIKE LOOSE WIRING CONECTIONS IN THE DRIVERS DOOR , BEST THING TO DO IS HAVE A LOOK OPEN UP DOOR PANEL AND CHECK ALL CONECTIONS, GOOD LUCK
SOURCE: 1993 Buick Regal - electric door locks, my Buick
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
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