Question about 2002 Mercury Mountaineer

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Alarm keeps going off

Also the inside dome lights keeps flickering along with it---the door ajar light is lit and all of the doors are closed (including the hatch). This happened once before, took it to a mechanic but the problem never occurred with him so he stated that all he did was clean the door contacts and this worked for months.

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  • Mercury Master
  • 4,369 Answers

One of your door switches is not completely closing for some reason. Try putting a sof shim on each switch, one at a time and see whcih one makes the problem go away. I would use one of those felt pads for the back of picture frames or chair legs to prevent scratching the floor.

One of them will solve the prolem and you can adjust the door or whatever to permanently fix it. good luck

Posted on Jan 12, 2009

6 Suggested Answers

  • 1 Answer

SOURCE: Ford taurus door ajar light stays on

I had the same problem. WD40 cured this in a flash! Be generous with the WD40 to allow parts to loosen and clean the "gue" that has built-up over the years. Several open and closings of the door should do the trick. Note that cold weather exasperates this condition. The best to you all in the new year!

Posted on Jan 01, 2009

blueextc3221
  • 15935 Answers

SOURCE: door ajar alarm

The doorlach pin is faulty.
On newer vehicles it is inside the door on the locking mechanism.
It is stuck in the closed position, or has become dislodged.
Refer to your mechanic for repair.

Posted on Jan 12, 2009

  • 188 Answers

SOURCE: liftgate ajar is on

Great Job-emissionwiz

Posted on Feb 01, 2009

jeremythious
  • 37 Answers

SOURCE: door ajar and dome lghts

Probably a door switch, check them first. Go to each door with a can of penatrating oil, find the switch in the jam, give it a shot and work the button manually until they're all freed up. Watch the light while you do this to eliminate which one's causing the problem. Please post your results.

Posted on Feb 08, 2009

  • 6 Answers

SOURCE: '96 Jeep Grand Cherokee -driver door shows ajar, dome light is on

remove the door switch, clean and reinsert. It switched ground to a black cable, which goes to the PCM.

Posted on Mar 30, 2009

  • 91 Answers

SOURCE: My door ajar light stays on sometimes while

spray the door latch with WD - 40 on both doors then open and close multiple times. Sometimes they get stuck ond this help if they free up once a month should keep it away

Posted on Apr 27, 2009

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1 Answer

What color are the wires that go from door switch to dome lights on a 2005 mustang v6 conv.


The door switch doesn't go to the dome lights , the switch (door ajar switch ) is an input to the SMJ - smart junction box or body control module take your pick .
Principles of Operation
When the SJB detects a request for lighting, it turns on the interior lamps by supplying power to the lamps. The request for lighting can be an open door signal from a door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a remote keyless entry (RKE) transmitter.
The door ajar switches are hard-wired directly to the SJB. The 2 door ajar switches are normally closed when the doors are closed. The decklid ajar switch is normally closed when the decklid is closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit.
The instrument panel dimmer switch receives a ground signal from the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the instrument cluster and a toggle ON/OFF function for the interior lights.
The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from an RKE transmitter, it unlocks the doors and turns on the interior lamps. There could be DTC'S diagnostic trouble codes stored in the SJB ! You can not access these codes with a OBD2 code reader , need a factory scan tool .
B1319 Driver Door Ajar Circuit Failure Go To Pinpoint Test D . B1327 Passenger Door Ajar Circuit Failure Go To Pinpoint Test D . B2021 Dome Lamp Input Return Circuit Failure Go To Pinpoint Test A . B2550 Dome Lamp Output Circuit Short to Ground Go To Pinpoint Test A . B2554 Dome Lamp Output Circuit Failure Go To Pinpoint Test D . Do you know B-codes -body control .
Your best bet is to take to a ASE certified repair facility or a Ford dealer .

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You need to have the Body Control Module scanned to determine the cause here, guess work won't solve the probem.

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You have a bad door latch sensor. This will flicker the dome light and trigger your alarm. It is either built into the latch or if you see a small button in the door jamb the switch is there just remove the nut and replace it.

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i must say that i feel your pain with this,, my door ajar light does the same thing but my dome light doesn't come on when the doors are open, i have to flick the switch on the dome light to make it come on. In my opion and i stress my opion it saounds like a issue with the body controller, im not sure what ford calls it but it controls all the body functions, i dont think the low coolant light is connected to the body contoller but i dont know this for sure, i think that light is controlled bny the engine ecm. some times a dealer can connect to the body controller and see if there are any fault codes for circuits that it controls and or monitors, also they can reflash or update the configeration and or calibration level cause ford release's fixes for issues all the time, same theory works for any control module on a vehicle. i dont think any of the auto parts stores have the right program to connect to bofy controlers but i could be wrong, worth looking into. i only put up with mine cause i use it as a beater, if you are worried about your dome light staying on and drianing your battery then you could pull out or disconnect the dome lights for the time being, its not a fix but just a band-aid.

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To temporarily solve the light problem, I taped a washer to the inside of the door where the door hits the plunger on the light switch. A permanent solution would be to drill a hole in the door at this spot and put a self taping screw in that will trigger the switch sooner. I figured out the reason the dome light stayed on is due to the courtesy light timer and the lights would have eventually gone off.

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I had this problem. I had to have a sensor in the door replaced.

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spray the door latch with WD - 40 on both doors then open and close multiple times. Sometimes they get stuck ond this help if they free up once a month should keep it away

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lol....dont feel bad.....it happens to ALL of us

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Door ajar alarm


The doorlach pin is faulty.
On newer vehicles it is inside the door on the locking mechanism.
It is stuck in the closed position, or has become dislodged.
Refer to your mechanic for repair.

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