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Headlight eyelids on while car is parked/asleep

Discussion in 'Model S' started by jmnieves, Jun 10, 2018.

  1. jmnieves

    jmnieves Member

    Joined:
    Nov 5, 2017
    Messages:
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    Location:
    New Jersey
    I just noticed my MS which is parked in my garage plugged into a HPWC but not charging and the eyelids on the headlights are dimly lit. I never noticed that before. eyelids.jpeg
     
  2. Derek Kessler

    Derek Kessler Member

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    Cincinnati
    What you're seeing is LED afterglow — basically a tiny amount of current is left in the circuit and the LEDs are drawing on it. It'll fade out eventually.
     
    • Informative x 1
  3. appleguru

    appleguru Member

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    Mar 15, 2017
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    Location:
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    If this fades out after a while, it is likely the phosphor on the white LEDs glowing (similar to how a glow in the dark toy will fade out over time after it stops being exposed to light). White LEDs are actually blue or ultraviolet LEDs with a rare earth phosphor coating that converts some blue photons to yellow photons as they leave the LED’s built in optics.

    If it doesn’t dim/fade out after time then it is likely that the circuit is still energized (but off) and that you’re seeing the effect of leakage current going through the LEDs...
     
    • Informative x 1
  4. Wal&Deb

    Wal&Deb New Member

    Joined:
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    Location:
    Olsene Belgium
    I noticed this LED glowing several times as well (new Model S September 2018), it even stopped after a while and suddenly started glowing again after the parked car made some 'getting a live' noises. First of all I was told the car was getting ready to receive the Version 9,0 update but this did not stop it... . Now I'm told this is a known issue for all cars from chassis number 180000 onward. The cause seems to be capacitors loosing their energy but it would not being of influence on the battery.
    What is strange dough is that once it is off it suddenly starts up again so the capacitors seem to recharge all the time ...
     
  5. SpudLime

    SpudLime Member

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    Location:
    Chantilly, Va (Loudoun)
    I noticed this on mine also about 3 weeks ago. Totally forgot to start a thread asking about it. Good to know I’m not the only one.
     
  6. thenaimis

    thenaimis Member

    Joined:
    Sep 26, 2016
    Messages:
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    Location:
    Texas
    I posted about this months ago. When I brought it up with the SC they just kinda shrugged their collective shoulders and said it's a software problem. It's definitely not an afterglow or charged cap sort of issue as it will continue this way over night (8+ hours).
     
  7. whitex

    whitex Active Member

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    Seattle area, WA
    Never happens on our 2015, occurres on 2017 and on 2018. My guess is Tesla left the headlight LED controller circuit on some shared voltage rail which doesn't turn off (or can't be turned off because the same rail powers something which needs to be ON), but the LED controller doesn't cut the current down to 0. The LED headlights are a more recent design. Tesla has been cutting corners for last few years, not doing as solid of a design as the pre 2016 cars.
     
    • Informative x 1
  8. jorobsand

    jorobsand Member

    Joined:
    Nov 12, 2017
    Messages:
    137
    Location:
    Charlotte, NC
    I see this on my December 2017 build. In fact, I was pretty used to seeing it all the time when my car was plugged in at home and I was going into a dark garage.

    Last night was the first night in who knows how long where I specifically noticed it NOT happening. I was so conditioned to it, I was actually worried something was wrong when I didn't see the afterglow.
     

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