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Re: 2002 ford explorer alarm keeps going off
Welcome to Fixya! I assume that this Alarm is Factory Installed? This is a Common Problem on the Ford Alarm Systems. There is a Relay in the System that is Malfunctioning. Have the Dealership Trace this and Replace the Relay and it will Stop.
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There's a sensor attached to the internal latch on your Explorer's doors. Over time, debris or corrosion can cause the senson to stick "open". Just open your doors and spray a good lubricant into the latch area. Open and close the door several times. You should be good to go.
most likely you have a door switch problem, you must take to shop to have it scanned, and they can tell you what door it is. most times it is drivers door, because that is the door that gets the most use.
Mine started doing this about a year ago. My mechanic could not find the cause. I located the horn fuses under the dash and the emergency module under the hood and yanked them. Now the alarm still goes off at random, but it doesn't make any noise. That was the best I could do for the poor thing. Also I now have no horn, which has helped to teach my wife to be a more patient driver. She loved that horn.
Open drivers door and look at the hinge area. You will see a black rubber accordion looking tube going from the door to the a-pillar. This is the protector for the wiring harness. Wiggle it and see if this recreates your concern. If it does then pop it loose at both ends so you can inspect the wiring.Check each one carefully,feel them and tug on them.You will be looking for one that the wire inside the wiring insulation has broken,the two wires to really look at closley are the YE/BK and BK .
It may also possibly be a door ajar switch sticking and for this take some WD40 and shoot some in each latch on the side of the door and open and close the door several times and this usually un-sticks it.
if the door ajar light is on then get a can of PB BLASTER at your local parts store and spray all the door latch assembleys really good and open and close each door about ten to fifteen times this will usually free up the ajar switch