Question about 2000 Mercury Mountaineer
Dome light won't come on when I open door but does when I turn on manualy where do I find switch on door
The interior lights do not come on when ANY door is opened, not just the driver door. This sounds like the relay for the door ajar switch. Where is that?
Posted on Oct 18, 2015
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Posted on Jan 02, 2017
SOURCE: i want to turn my
unfortunatly some of the mercury's came with a instant on dome light that will always come on once the door is opened, and stays lit for a period of time then slowly fades out, if this is the case with yours,, there isn't much you can do about it unless, you remove the lens cap and pull the bulb, removing the fuse that runs this light will also dismantle other items in the cab compartment
Posted on Aug 10, 2011
i would hazard a guess and say that wires in the rubber boot from the door pilar to the door are damaged or the connection block in the door pillar in this the terminals are corroded or something similar
Posted on Nov 22, 2011
Sounds like there is a loose ground wire inside the door panel, but the doorjam switch should be what determines the off and on. It is located in the doorjam.
Sometimes the wiring that goes through the doorjam can hide a broken wire inside. There are more connections in the drivers door because it is the Master location for all the other locks and windows.
Go to Autozone.com for wiring diagrams for free. Just register your car and you can get chassis diagrams to show where the wires are for that circuit.
If you are going to fool around with the wiring, disconect the battery first. The only big thing is the controls for the outside mirror can make the removal of the door a little more difficult.
Posted on Mar 29, 2012
Tips for a great answer:
The liftgate lamps
The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !
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