Question about 2002 Mercury Mountaineer

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Door ajar light, drivers door

Where is the switch for the drivers door dome light switch, always shows door ajar, narrowed it to the drivers door. took panel off, followed all wires, dont see a switch for it anywhere. is it in the door strike mechanism?

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  • jdmatthew1 Jun 29, 2009

    actually on a 2003 the switch is located in the latch mechanism, spraying wd40 into the latch will free up any dirt lodged in it and usually the switch will start working again, i found the answer under ford explorer and just tried it, and it worked.

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  • Mercury Master
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Its on the pillar, part of the main body, not the door itself. Usually close or under where thedoor latch meets the stricker. It may have a small rubber boot on it (They do go bad, and are fairly cheap)

Posted on Jun 29, 2009

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Posted on Jan 02, 2017

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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 .

Jan 01, 2016 | 2005 Ford Mustang V6

1 Answer

The dome light will not come on when driver door opened. Door jamb switch is fine.


Have you tried a little squirt of wd40 or graphite in the door jam switch and then hand manipulate it a few times?

Feb 14, 2015 | Cars & Trucks

1 Answer

Door ajar light stays on


Why is it that a door can be ajar but a jar cannot be a door? - Always wondered about that one....:)

On a more serious note: Ford Explorers are notorious for the door ajar switches going bad. I have seen them com on by themselves when the vehicle is parked and cause the battery to go dead because they will turn the dome lamps on also.

Most of the time it is the driver's door that has the problem, but ANY of the doors COULD be tha cause. It would be best to scan the computer system and look at the Generic Electronic Module (GEM) data to see which door is showing "open" when you have all the doors closed. Otherwise, you may have to disassemble ALL of the doors to find the culprit if replacing the switch in the driver's door does not fix the problem. The first picture below shows the switch itself. The second picture shows how the switch is mounted in the door latch mechanizm inside the door panel.


11_30_2011_12_36_43_am.jpg

11_30_2011_12_37_12_am.jpg

Nov 28, 2011 | 2003 Ford Explorer

1 Answer

Having trouble with door ajar dome light staying on when door is not actually ajar?


There is a switch that connects to the door latch inside the door. They can get sticky or come loose causing your complaint. Usually it is the drivers door since that door gets used the most. The door panel has to come off to access the switch. Sometimes you can remove the dome light fuse to take care of the light and indicator until it gets repaired.

Jan 10, 2010 | 1998 Ford Explorer

2 Answers

2001 Ford Escape, dome light will not go off when door shut, but door ajar light is dark?Could this be the door switch? are there different switches for the door ajar light and the dome light? How can I...


The door switch provides a ground to the dome light... so there is no danger to you if you want to attempt a removal of the switch. A rusted or shorted wire in the door switch (of any door) will keep the dome light on.

Oct 14, 2009 | 2002 Ford Escape

1 Answer

2004 crown vic interior lights stay on


Don't think you have a door ajar switch problem , more then like the lighting control module is the culprit . Does the door ajar light on the instrument cluster stay lit ?
The interior lighting can be separated into two distinct modes of operation: the courtesy lighting and the demand lighting. The lighting control module (LCM) controls all of the interior lighting in the vehicle, as described in the following text.
The front dome lamps, rear reading lamps, and instrument panel courtesy lamps, can be illuminated either by opening any of the vehicle doors (courtesy lamp function) or by depressing the headlamp switch (demand lamp function).
When any door is open, the door ajar switch grounds an input to the LCM which then sends power to the courtesy lamps. The voltage sent to the courtesy lamps gradually increases from 0 volts to 12 volts within 500 ms (± 50 ms), to achieve the theater lighting effect. When the door(s) are closed the door ajar switch(es) break(s) the ground to the LCM input which then gradually reduces the power from 12 volts to 0 volts within 5 seconds. (± .5 second).
When the headlamp switch is depressed it grounds an input to the LCM which in turn sends 12 volts to the front dome lamps, rear reading lamps, and instrument panel courtesy lamps. When the headlamp switch is depressed a second time, it breaks the ground to the LCM input which then ceases to send power to the front dome lamps, rear reading lamps, and instrument panel courtesy lamps.

The battery saver will disrupt power to the courtesy lamps after 10 minutes, the demand lamps after 30 minutes, and the headlamps after 10 minutes. Turning the ignition switch to the RUN or ACC position will terminate the battery saver feature by disabling the interrupt timers and reinstate power to the lamps.
Do you know what DTC'S are ? diagnostic trouble codes !
LCM Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1322 Driver Door Ajar Circuit Short to Ground LCM Go To Pinpoint Test F . B1442 Door Handle Switch Circuit Failure LCM Go To Pinpoint Test G . B1445 Door Handle Switch Circuit Short to Ground LCM Go To Pinpoint Test G . B1563 Door Ajar Circuit Failure LCM Go To Pinpoint Test C . B1566 Door Ajar Circuit Short to Ground LCM Go To Pinpoint Test H . B1685 Lamp Dome Input Circuit Failure LCM Go To Pinpoint Test I . B1687 Lamp Dome Input Circuit Short to Battery LCM Go To Pinpoint Test I . - All Other DTCs LCM REFER to Section 419-10 .

PINPOINT TEST C: THE COURTESY LAMPS STAY ON CONTINUOUSLY CONDITIONS DETAILS/RESULTS/ACTIONS C1 CHECK THE SYSTEM OPERATION Open and close each door, making sure that each door is completely closed.
  • Are the courtesy lamps still illuminated after the 25 second time-out period?
Yes GO to C2 .

No The system is operating correctly. C2 TEST DOME LAMP SWITCH Depress the dome lamp switch.
  • Are the courtesy lamps still illuminated?
Yes DEPRESS the dome lamp switch a second time. GO to C3 .

No The system is operating correctly. C3 CHECK THE LIGHTING CONTROL MODULE
LCM C2145a

  • Are the courtesy lamps still illuminated?
Yes REPAIR circuit 53 (BK/LB). REPEAT the self-test. CLEAR the DTCs.

No INSTALL a new LCM. REFER to Section 419-10 . REPEAT the self-test. CLEAR the DTCs.

Apr 16, 2017 | 2004 Ford Crown Victoria

1 Answer

'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.

Mar 25, 2009 | 1996 Jeep Grand Cherokee

2 Answers

"DOOR AJAR" Light Always On... Even with all doors shut... As a result the dome light is always on and "DOOR AJAR" shows up instead of the electronic speedomter so it can be seen how fast the vehicle is...


spray some lubricant (wd40 etc.) into the lock mechanism on the doors .. the switch may be jamming up ..

The front door entry system contains a latch that is fastened to the inside of the door frame and is controlled by the exterior and interior door handles. The latch contains a door ajar switch and a door lock actuator. The front doors can be locked/unlocked by the remote keyless entry (RKE) transmitter, the RKE keypad, the door lock control switch or the door lock cylinder .

Feb 11, 2009 | 2005 Ford F-150

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