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Ambient Lights Bright Dim Off

Discussion in 'Model S' started by Joelgjr, Aug 14, 2018.

  1. Joelgjr

    Joelgjr Member

    Joined:
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    224
    Location:
    Boston MA
    So I was sitting in my parked car and the headlights were running (and set to auto, as it was dark in the parking garage).

    As expected, the Ambient lights in the doors were on as the Ambient setting was tapped on. I tapped the Ambient button, it turned from blue to white, and the ambient lights got significantly brighter. As I tapped Ambient on and off, the lights cycled between dim and bright.

    I was under the impression that ambient lights are either on or off. There is no dim or bright? I was so surprised by this behavior I got out of my car, locked it, and got back in, and the Ambient lights returned to expected functionality, either On or Off (dim only).

    No matter what setting my headlights were set to and whether running or not, I could not reproduce the Ambient high/low that I had just experienced.

    What happened here - is this normal?
     
  2. JohnnyG

    JohnnyG Weee!

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    Sounds like a feature has become buggy. I just went out to my car to see... I could reproduce it the first time, but then couldn't reproduce it subsequent times.

    How it used to (suppose to) work: The Ambient lighting would come on at full intensity when in Park while the headlights were not illuminated (for better visibility entering/exiting). This would timeout after a while. The Ambient lights also come on at a lower intensity when the headlights are illuminated and the button was selected.

    Edit: hmm, I wonder if it also uses the ambient light sensor in the rearview mirror to perform differently for night vs day, and maybe this isn't reacting properly?
     
  3. snd92

    snd92 Member

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    Ambient light intensity follows MCU/ICU display intensity.
     
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  4. Joelgjr

    Joelgjr Member

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    Not on mine!
     
  5. JohnnyG

    JohnnyG Weee!

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    With Ambient turned on, and headlights turned on, the ambient lights do vary with the MCU brightness.

    It is not infinitely variable, however.
    Here are the percentages at which it alters:
    20%, 34%, 47%, 60%, 74%, 87%.
     
  6. JohnnyG

    JohnnyG Weee!

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    I was able to reliably reproduce the bug...
    If it is not night time, try this in a dark garage.

    1. Enter the car after it has been sitting, and Car is Off.
    2. Do Not touch the brake pedal.
    3. If it is dark outside your car, your MCU display brightness should be down to 15% (or so).
    4. Turn off your Ambient button.
      1. Note that the Ambient lights are on and full bright.
    5. Turn on your Ambient button.
      1. Note that the Ambient lights are on, but now dimmer.
    6. Touch the brake pedal to turn On the Car.
    7. If the headlights do not come on, turn them on manually.
    8. Repeat steps 4 & 5.
      1. Note that the Ambient light does not illuminate now, when the Ambient button is off.
     
  7. .jg.

    .jg. Member

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    Feb 27, 2018
    Messages:
    260
    Location:
    Weston Super Mare, England
    My car was returned from service today and I asked about this behaviour of ambient lighting... This was the response:

    Concern: Customer: Ambient light behavior - seems to be off or less bright when "Ambient"
    selected.
    Pay Type: Goodwill - Service
    Corrections: Interior NVH General Diagnosis
    No fault found with ambient lightening, everything working as designed.
     
  8. JohnnyG

    JohnnyG Weee!

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    "... No fault found with ambient lightening, everything working as designed..."
    Yep, based on your concern, unless you have Auto-Brightness turned off, and brightness set at 100%, it will be dimmer when the Ambient button is on, because it's intensity changes with the MCU brightness.
     
  9. mknox

    mknox Well-Known Member

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    9,903
    Location:
    Toronto, ON
    I had a similar problem once. I figured out what it was on my own, but had Tesla fix it. At a recent service they had removed my door panel. The electrical connectors for the ambient lights and the puddle lights on the bottom of the door are identical. You guess it... they had reversed the connectors. Swapping them back fixed my issues.
     

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