Question about 1991 Buick Regal

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The auto door locks on my 1991 buick regal quit or only work intermittenly. I bought a new transmitter (hand unit) and replaced the relay under the dash. The dealer could only program the new hand piece to work only the doors not the trunk. Ont the inside of the car the lock and unlock buttons only work once in a while. Are there anymore relays associated with the auto door locks? Tired of opening the dorrs with a key! Wolfman

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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...

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

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THE REMOTE DOOR LOCK ON A 2000 BUICK CENTURY HAS QUITE WORKING. THE FOBS ARE GOOD BUT WON'T OPEN ANYTHING.


The transmitter may have lost programming,
In the event that a transmitter is lost, program the old and the new transmitters into the memory of the remote control door lock receiver. Up to 4 transmitters may be programmed.

IMPORTANT:

  • Once entering this procedure, programming the first transmitter erases all previous transmitters. You must program all transmitters.
  • Program one vehicle at a time. One transmitter could be programmed into other vehicles that are also on program mode in close proximity.
  1. Sit in the driver's seat.
  2. Remove the ignition key from the ignition lock cylinder.
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  4. Press and hold unlock on the door lock switch.
  5. While holding the door lock switch in the unlock position, insert and remove the ignition key twice. Do not rotate the ignition lock cylinder.
  6. Insert the ignition key a third time leaving the key in the ignition lock cylinder. The ignition must remain in the LOCK position for the rest of the procedure.
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