Question about 2000 Mercury Grand Marquis
When the car is sitting and every thing is shut off; the interior lights will come on and go off like the door was opened and closed
There is a door switch on each door that causes the light to go on when that door is open. Sounds like one of them has gone bad. Take the drivers door switch out first (it is the most used) and see if problem continues. if not, you found your problem.
Posted on Mar 21, 2014
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Posted on Jan 02, 2017
There are 2 things we see on these models. 1st one is it could be a stuck door adjar switch. For this you can try and put WD40 into the latch on the side of the door, put a generous amount directly into the latch then close and open the door several times.This will un-stick a switch most of the time.
2nd thing it could be, open the door and look at the front of the opening between door and A pillar and you will see a black rubber accordian tube running between body and door,this is where the wires run from body to door. Sometimes a wire will break inside this.You can usually verify this by taking a screwdiver and trip the latch so that it shows the door closed(even though u have it open) then wiggle that harness and see if it effects the door adjar light.
Posted on Feb 11, 2009
I had the same problem in my 98 and 96 Sables. Ford dealer says it is a problem with a sensor, located behind the left rear quarter panel. It doesn't recognize when the doors are closed, therefore it leaves the dome light, etc. on--sometimes briefly, but possibly until the battery goes dead. Worse when the weather is damp. Their solution was to throw it on the diagnostic computer BUT ONLY WHILE THE PROBLEM IS ACTIVELY HAPPENING, then replace the sensor--they quoted me a minimum of $300. I leave the cover off the dome light, and pull the bulb when necessary.
Posted on Apr 08, 2009
Each door has a door ajar switch in the latch. You can either take some WD40 lube each latch opening and shutting each one 4 to 5 times after spraying, or you can replace the switch
Posted on May 10, 2011
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