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Are some of USB outlets unswitched (always on)?

Discussion in 'Model S' started by bluhorshue, Jun 20, 2018.

  1. bluhorshue

    bluhorshue Member

    Joined:
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    Location:
    Seattle Wa
    I have a 2013 Model S. I wanted to install a dash cam (it's a DDpai mini, a rather cheap 1080 dash cam), so after much reading I was prepared to install by using cord in speaker grill between the two cabin lights. After I even bought the adapter, I opened the grille and the cable that is supposed to be always on was not there. I then ordered the OBD power adapter, but just decided to test my dashcam in to the usb port next to the cigarette lighter while I waited for it to arrive.

    As far as I can tell, it has been on for hours even though the car should be off. Is the USB outlet supposed to be unswitched? I thought they only powered on when the car is on. Does it just stay on because it was plugged in before the car was shut off? Will it continue to stay on?

    thanks,,
     
  2. appleguru

    appleguru Member

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    I’ve noticed this too recently; the 12V port is definitely switched... but the USB ports may be “always on” (unless the car goes into deep sleep. They are connected to the center screen, which is “running” even if the car and screen are off... so this makes some sense.
     
  3. Ande

    Ande Member

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    Norway
    There is permanent 12v over the rear view mirror.
     
  4. E-Ryc

    E-Ryc Member

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    I think rear view mirror is switched, permanent one is under the microphone plate (in my car sth is connected to it - tilt sensor maybe?).
     
  5. whitex

    whitex Active Member

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    Check deeper under the roof in the microphone grill. Some of the early cars had then hidden deeper, but still reachable to pull out.
     
  6. E-Ryc

    E-Ryc Member

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  7. bluhorshue

    bluhorshue Member

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    Location:
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    Thanks for your responses. I've attached a photo to show that there isn't the wire under the microphone grille that is there in most other Model S's. I read that the first cars all had the wire, and then for a period in 2013 they do not, and then Tesla resumed putting that powered wire in the car later in 2013. My car must have fallen in that gap. That would definitely be the cleanest install method, and was why I ordered the computer fan cable.

    I did get a dash cam time lapse video of the light from the sun rising and the windows in my garage getting brighter, so I can say with some confidence that the USB ports in my car at least (YMMV) maintained constant power to the dashcam overnight. I was also able to charge my phone briefly as well though I did not leave my phone in long enough for a full charge, and the phone charging is definitely slower than it would be from my usual charger. So there aren't enough amps to charge my phone all that quickly, but enough for the dash cam which needs less than 2 amps.

    Not sure whether I will prefer the OBD power wiring or the USB wiring right now. I'd think the OBD wiring would be neater, but not by much, and I could keep the USB port free too, but can't be sure about it until I receive the cable.

    IMG_0046.JPG

    [​IMG]
     
  8. whitex

    whitex Active Member

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    Sep 30, 2015
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    That box is a car alarm sensor and/or siren available in Europe. In US it was never offered, but the wire harness was always there (with few possible exceptions).
     

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