Question about MTX Ford Explorer/Mercury Mountaineer/Mazda Navajo 1991-2001 Thunderform Loaded with 10 Inch Woofer and ... Car Speaker

4 Answers

2004 mercury mountaineer door ajar light

The 2004 mercury mountaineer that i own is giving me trouble with the door ajar dash light staying on. All doors are shut properly but the interior lights stay on unless i turn them off manually and the alarm will not turn on as well.

Posted by on

  • 6 more comments 
  • noah421 Jun 06, 2008

    I am having a similar problem in my '03. Seems like people are suggesting WD-40 in the latches to loosen up any sticking.

  • sjsears Oct 23, 2008

    Same problem here - 2005 Mercury Mountaineer.  Also when I have my interior lights manually turned off - when I push the rear defrost, my door ajar alarm goes off.  HELP!

  • ConHuskerFAN Nov 17, 2008

    Same problem here with a 2003 Mountainerr

  • jessicabemis Dec 18, 2008

    I have a 2003 Mercury Mountaineer, seems like it slowly started happening, out of nowhere the door ajar light would come on, then eventually the dome lights would stay on when I would leave the car and I'd have to jump it. Now I manually turn the lights off with the interior switch every time I leave the car. Now when I hit the rear defrost the door ajar light comes on too.

  • danjones68 Jan 16, 2009

    Same Problem 2003 explorer door ajar light is off. I have to manually turn the interior lights off (Panel). Turn the rear defrost on and the door ajar light comes on. I have tried spraying the door latches and it did fix the door ajar light from coming on but the interier light will stay on unless the manual panel switch is tured off.

  • mmann719 Feb 10, 2009

    Same problem on my 2004 Mountaineer. Tried WD-40 on the latches, and that didn't work.

  • jdembro Mar 02, 2009

    Have the same on my 2003 Mountaineer. Rear defrost turns on door ajar. Have to manually turn off dimmer or dome lights stays on-also auto lock says door is open(honk-honk).

  • Anonymous Apr 03, 2009

    I have the same problem with my 2004 Mountaineer. If I turn on the interior lights the door ajar comes on and if I turn off the interior lights by using the panel I can lock my doors properly. I have lubricated the latches on the door and is still experincing this problem.



4 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Ends up being a broken wire(ground) in the rubber boot between door and frame. I carefullly removed door panel, pinched the ends of the boot and slid it back into door. And there it was...a broken black wire. Spliced in a new piece of wire, reassembled everything else. Everything works like it should. It's really not that hard just take your time. Also before I started I disconnected the battery as a precaution. Goodluck.

Posted on Mar 08, 2009

  • Your Moma Jan 21, 2012

    We bought a 2004 in Austin. It has been a remarkable vehicle. Im sure the next baby will be what ever u need in America Suv. Gas is decent , comfort , and performance. Im not a look person. But this light problem has been going on four a month . Now Thanks for the help I bought a new battery. Cause the battery was being drained. With a 30 minute light on dujring a wedding last month. We had took 15 min to charge battery then we got it crunkkkkkk. Peace


  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 27 Answers

Could be a sticking latch, a short in one of the door latches, a problem with the dome light circuit itself, or a short in one of the wires. Look under the door seals and see if any wires have been caught or screwed through. Put some lubricant on the door latches. Last resort, start taking the doors apart 1 by 1 and disconnecting the door triggers in the latches. When you get the right door disconnecting it will make the other doors work right. Then you can replace only that 1 door latch. Otherwise you can just start replacing door latches till you hit the right one. If its in the dome light circuit there is a Black/lt blue wire in the driver kick panel in a harness to the rear. This wire shows + when the dome light is on. You might have some luck traceing this wire.

Good luck.

Posted on Dec 18, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Yes, all it took was 30 seconds first WD40 to lubricate the sticking latch then open / close couple times problem solve. Good luck

Posted on May 09, 2010

  • wteles84
    wteles84 Jan 07, 2012

    very true. All i did was spray the latch and the problem is instantly gone! thanks for the hint.


  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.

  • Contributor
  • 1 Answer

My husband sprayed all of the door latches with WD40 and problem solved for this 2003 Mercury Mountaineer.

Posted on May 26, 2013

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

How do I stop the door ajar sound from randomly going off while driving down the road in my 2003 Ford explorer?

The switch that turns the interior lights on when you open the door also controls the door ajar sound and light on dash board now that switch
Is either in the door hing or it's a pin switch that sticks out of the pillar post that switch is going bad you have to locate it and replace it hope this helped

Apr 19, 2015 | 2003 Ford Explorer

1 Answer

Where is the door switch on 2002 Mountaineer

Generally speaking they are inside or attached to the door latch.
If you check with the dealer you should be able to look for the part in the door once you know which version you need.

Mar 03, 2013 | 2002 Mercury Mountaineer

1 Answer

Door ajar light keeps coming on while driving and inside lights stay on when park

Bad door switch on one or more doors. There's one in each door jamb.

Mar 06, 2011 | 1997 Mercury Mountaineer

1 Answer

Door ajar light doors are closed.

very common check inthe door jam and see if the leaver which is usually black moves freely may have a wire disconnected from that

Mar 08, 2010 | 1998 Mercury Mountaineer

1 Answer

Door ajar light on and interior lights wont shut off

You more than likely have a bad door ajar switch. A technician can check this with a scan tool and tell you which switch is bad. This is a very common problem with Fords/Mercurys. GL

Dec 26, 2009 | 2004 Mercury Mountaineer

1 Answer

Door ajar dash trouble and dome light stays on even if all doors

The door sensors will need to be replaced. A screws can be removed and then a wire can be taken of and you then can replace the switch.

Sep 25, 2009 | 2001 Ford F250 Super Duty Super Cab

1 Answer

Door ajar dash light staying on

your sensor in the door lamb is bad or its the sensor for them

Jul 31, 2009 | MTX Ford Explorer/Mercury...

1 Answer

2003 Mountainer location of OBD2 connection

it is under the dash on the drivers side just to the right of the column.

Dec 21, 2008 | 2003 Mercury Mountaineer

Not finding what you are looking for?
Car Audio & Video Logo

4,119 people viewed this question

Ask a Question

Usually answered in minutes!

Top MTX Car Audio & Video Experts


Level 2 Expert

150 Answers


Level 3 Expert

78267 Answers

Mark Skinner

Level 2 Expert

77 Answers

Are you a MTX Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides