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What is the little black box under the rear view mirror??

Discussion in 'Stock 2002 - 2005 Explorers' started by mike1970, June 26, 2010.

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    1. mike1970

      mike1970 New Member

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      I have a 2004 Ford Explorer and the Rear View Mirror has a little black box under it and it has a button on it, can anyone please e-mail me to tell me what it is Please?
      Mike
      Mwc70@yahoo.com
       
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    3. dannym52fire

      dannym52fire Member

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      The little black box under the mirror is the auto dimming feature on the rear view mirror. I have one in my 02 and it is in place of the little tab that would be on the bottom of the mirror. If light shines on the mirror, it will adjust so there is no glare.
       
    4. Curtis

      Curtis Well-Known Member

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      Huh.. I always thought it was something to do with the compass..
       
    5. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    6. muzzymaniac

      muzzymaniac Active Member

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      Has nothing to do with the dimmer - that's the little sensor on the side of the mirror you look at right next to the green light. The box by the windshield is the compass.
       
    7. abarkl

      abarkl Active Member

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      The button on the box by the windshield initiates the calibration sequence for the compass. Read your owners manual for the exact procedure.
       
    8. EXPLORER04

      EXPLORER04 Active Member

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      anyone have a part number for this, as mine broke
       
    9. Jdog69

      Jdog69 New Member

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      i have that little box on my '02 also but I don't have a compass? or do I?
       
    10. Curtis

      Curtis Well-Known Member

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      If its a 3rd gen I think they all had it? It should be in the screen where your mileage is displayed.
       
    11. dannym52fire

      dannym52fire Member

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      its definitely for the dimmer because all 3rd gens dont have the box, but they all have compasses...
       
    12. Curtis

      Curtis Well-Known Member

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      Its not for the dimmer, its for the compass

      [​IMG]
       
    13. Merc02

      Merc02 Active Member

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      all three of the search results have the word "windshield" in them when I search for compass on tasca ford parts website.
       
    14. BigRondo

      BigRondo USMC 1371 Staff Member Moderator Elite Explorer

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      I have the exact same thing as the picture shows in the post by Curtis. On my '02 XLT the box IS the compass. The OP said he has a button on his. I don't have the button. I have a pinhole used to reset the compass. Maybe the OP has something different. We won't know that unless he chimes in again as he has been silent since his thread starter.:salute:
       
    15. dannym52fire

      dannym52fire Member

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      Oh, ok. Thanks Curtis, so how does the dimmer work then?
       
    16. Curtis

      Curtis Well-Known Member

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      There is a sensor on the front and back of the mirror.
      The one facing forward is the main sensor.
      When it senses daylight conditions, the sensor in the mirror glass facing rearward is disabled.

      When the one facing forward senses dark conditions, the one in the glass facing rear is enabled. It will reduce the reflectiveness of the mirror.

      If the vehicle is put in reverse, both sensors are disabled and the mirror should brighten.
       
    17. dannym52fire

      dannym52fire Member

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      oh ok. whoever came up with that is a genius, at least smarter than me
       
    18. Curtis

      Curtis Well-Known Member

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      Yes Me too !
       
    19. muzzymaniac

      muzzymaniac Active Member

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      Damn you guys! Now I'm going to have to look around for the other sensor. The only sensor on the mirror I know about is the one that faces into the vehicle. It senses bright headlights from the rear of the vehicle and dims the mirror.
       
    20. Curtis

      Curtis Well-Known Member

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      I think you're right. no sensor on the back of the mirror, I think its on the dash... I'll check the service manual if I think of it tomorrow and report back.
       
    21. abarkl

      abarkl Active Member

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      One of those sensors is used to activate the auto headlights if you have them.
       
    22. dannym52fire

      dannym52fire Member

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      There are 2 little LED looking things on the face of the mirror near the power button. Is one of them a sensor?
       
    23. Curtis

      Curtis Well-Known Member

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      I looked in the service manual again, it does not say exactly where the sensors are. Just that there are forward and rear photoelectric sensors that work in the way I described above.

      The 2 LED looking things on the mirror itself ... the Green one tells you if power is on for automatic dimming. The other one on the right is clear and I believe is the sensor facing the rear.
       
    24. muzzymaniac

      muzzymaniac Active Member

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      That's deff on the dash - near or in your Pats LED. Throw a glove or piece of cardboard over it and your light will come on.
       
    25. abarkl

      abarkl Active Member

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      In my '03 Escape the sensor was in the mirror.
       

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