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Re: Where is the door contact switch?
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.
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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?
U have a driver door defective courtesy light switch, this sytem has what is called delyed exit, it keeps all the accessories on until one of the door is opened, driver or passenger front will turn it off, so if the passenger front door shuts the radio off u need to replace the switch.
sounds like your "pin switch" in the door jamb is either bad or stuck. This is the switch that the car uses to tell the door has been opened. Does the light inside the car light up when you open the drivers door? if not, it is definately the door pin switch. should be a 10-20 dollar part at any gm dealer.