Random Shut Down during MID clock time change

Discussion in 'Prime Main Forum (2017-Current)' started by mrchowmein, Nov 1, 2020.

  1. mrchowmein

    mrchowmein Member

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    So, i was sitting in the driveway with the prime plugged in. I had the car on but not in ready mode to run the heater while I cleaned the interior of my car windows. I then proceeded to change the clock settings for BOTH clocks. I found that aspect annoying since they operate independently and does not auto update even with the GPS, but that's a separate rant. When I changed the time via the MID. The moment i updated the hour and pressed back on the steering wheel, the car shut off. I found that kind of odd. I tried to reproduced this, but I was unable to. Any clue, this is a serious bug if the car shuts off during a time change to the clock.

    I've had the 2020 Prius Prime for about a month and logged in 2,000 miles. First bug I've noticed was a random reboot the infotainment screen. I hope Toyota will release more software updates to address these issues as this car is 3 years in and is still exhibiting reboots.
     
  2. Trollbait

    Trollbait It's a D&D thing

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    If you aren't in Ready, the car might auto shut off to keep the 12v battery from draining.
     
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  3. mrchowmein

    mrchowmein Member

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    the car was on for no more than 3 mins before the shut off. like I said, it shut off right when I changed the clock. this is like some Y2k sh*t. jk
     
  4. schja01

    schja01 One of very few in Chicagoland

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    What @trollbait said. The car is protecting its anemic 12 volt battery.
     
  5. Trollbait

    Trollbait It's a D&D thing

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    Coincidence does mean causation. You weren't able to get it to happen again.

    If heating can actually run without being Ready, it will be a heavy load on the 12v battery. I thought the heat pump ran off the traction battery.
     
  6. mrchowmein

    mrchowmein Member

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    I just had the car on but not in ready for 10 mins with the heater running. The car didn't shut itself off within 3 mins like earlier today. When the heater was on, the estimated EV range dropped. So the heater should be running off the traction battery and not the 12v.
     
    #6 mrchowmein, Nov 1, 2020
    Last edited: Nov 1, 2020
  7. schja01

    schja01 One of very few in Chicagoland

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    The heat pump is definitely a high voltage device.
     
  8. m8547

    m8547 Senior Member

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    The estimated range logic is useless. It drops a fixed amount whether the heater, AC, or just the fan is on. It probably drops with the car is in "ignition on" mode even though the compressor isn't running. The fan runs off the 12V battery.
     
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  9. jerrymildred

    jerrymildred Senior Member

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    I'm only slightly surprised the estimated range dropped. When the car is not in ready mode, the traction battery is physically disconnected from the car. That means only fans can run, not the compressor, which is high voltage. My guess is that the estimated range dropped because the car said, "Hey, I'm gonna have to use the traction battery to recharge the aux battery that this guy is using up with the blower fan and the dash lights and the computers." I'm 99.9999% sure that the actual state of charge did not change.

    When you mess with stuff like that, put it in ready so you don't drain the 12V. IGN and ON really server no purpose on a Prime except to drain the 12V if you have any EV range available.
     
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