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Sensors on Interior Rear View Mirror

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3.7K views 13 replies 5 participants last post by  jeyjey  
Have you checked to see if that second one might be the automatic headlight sensor?

I know that the ambient light sensor for that function is usually on the dash itself, but who knows. Do the Seraph's have auto-high-beam-dipping? If so, it could be for that function, too.

Based on a very quick check of IETIS these mirrors appear to be Magna-Donnelly units that were used on a very great many marques. You might try searching on just Donnelly mirror and seeing what models and sensors show up.

@alabbasi, all kidding aside, I'm like you. Even though my partner's truck has a backup camera I don't trust it as much as I trust my own eyes oriented in the appropriate direction. I'm trying to learn to trust, as the fisheye feature catches things your own eyes can't, but I will probably always default to looking behind me and using the side mirrors in conjunction with doing same. I do have to say, though, that I like the feature on his truck where the backup safety feature starts beeping at you, slowly at first, and with increasing speed as it detects the rear of the vehicle and whatever obstacle it's detecting draw ever nearer. And it only starts once you're within something like 3.5 to 4 feed of that obstacle.
 
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Take a look at the wiring diagram. Whatever it is will certainly be accounted for there.
 
I presume you're asking about part number C0256, shown in this component location diagram, which I got to via the wiring diagram (though I found C0255, the electrochromic mirror first, then used what I saw in the diagram - same one - labeled C0256 on which to search):

Image
 
JR,

I don't believe that means auto-dipping, as in it will take your headlights from high beam to low beam as another car approaches.

The name "Auto headlamps light sensor" implies to me that this is the light sensor that is used to determine when the headlights turn on automatically when the light is low enough. Covering it with a piece of electrical tape during daylight hours had ought to test out my theory if you have your headlights set to Auto.