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Gadget in forward-facing (non-mirrored) side of rear view mirror -- what is it?

Discussion in 'Model S' started by berkeley_ecar, Apr 6, 2017.

  1. berkeley_ecar

    berkeley_ecar S 90D (fully loaded) delivered 18 Mar 2017

    Jul 21, 2014
    Berkeley, CA
    While experimenting with placing my FasTrak toll transponder, I noticed that on the driver's side of the rear view mirror, on the forward-facing side of the mirror, is a small recess just about big enough to put the tip of your small finger into (*not* that I am recommending that you do so! :) ). At the bottom of this well, there appear to be two distinct optical elements, which seem to be red or green at various times. Here are some rather dreadful photos (apologies for the poor focus, but it was very difficult to manipulate a phone cam in that spot, and I don't have a macro lens for it, either). What is this gadget? What purpose does it serve?
    2017_Tesla_Mirror_01.jpg 2017_Tesla_Mirror_02.jpg
  2. chillaban

    chillaban Active Member

    May 5, 2016
    Bay Area
    That's typically the auto-dimming mirror's light sensor

    There's also usually another opposing one on the side of the mirror facing you. If you shine a really bright flashlight around the edges of the mirror, you may see it.
    • Informative x 3

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