The driver side door lock only works when the interior light switch is turned off. The radio also shuts off before it normally would when the interior light switch is on, but works normally when the interior light switch is off
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You are on the right track...the problem appears to be on the driver side rear door actuator switch...locate this spring loaded sensor usually on the inside of the door by the hinges...spray it with PB Blastor, or WD 40...(Blastor works better) and move the switch back and forth...this should loosen up the sticking actuator and return your Buick to normalcy...Hope this helps
That buzzing sound was probably a short circuit in the switch panel. You will need to take the door card out and replace this panel. First check the fuses though. You may have blown a couple of extras because of the short. Did the door get wet on the inside somehow?
this problem i have repaired many times.. it is normally a broken wire in the flexible rubber tube between the door and the doorjamb from years of flexing back and forth when you open and close the door.. i hope that helps
I had the same problem and found that my sliding side door "closed" switch, which is small and round and in the door frame, was not being pushed open all the way when the door was closed! As soon as I put a credit card in the spot where the switch hits the door all the locks and lights worked again. So I just taped a washer to the door where the pin switch hits it for now. The computer thinks the door is still open and will not alow them to lock and the lights won't operate right either.
Check all 4 doors to see what works and doesn't work, be sure the interior domelight switch is set to turn on automatically when any door is open as well try the radio then open the 4 doors to see if it turns off...if your driver's side door don't work as you stated then that should be the door's "at fault".
GM built the door contact switch that's installed INSIDE the door-it's located inside the door striker/jamb area...it require removal of door trim to gain access.
However, you might want to try this visual inspection:
Check the thick wire harness located between the front-left door and door sill frame to see if any wire has been disconnected/cut or tampered with by previous owner.