HVAC control panel acting weird

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by trentofdestiny, Jul 15, 2019.

  1. trentofdestiny

    trentofdestiny Master Finagler

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    Today when I left work the HVAC was off from my trip to work. I pressed the auto button and maybe slipped and hit the recirc button at the same time. All the LCD segments came on and started flashing. Then it read 00 degrees. I had to turn the car off and back on to make it work. I could not reproduce it again by hitting two buttons at the same time. What was going on? Was it a self test mode? It was 90 degrees out today, which is pretty hot, even for here.
     
    #1 trentofdestiny, Jul 15, 2019
  2. ChapmanF

    ChapmanF Senior Member

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    AUTO + RECIRC together (usually right when you are powering the car on) is exactly the combo to get the HVAC diags.
     
    #2 ChapmanF, Jul 15, 2019
  3. trentofdestiny

    trentofdestiny Master Finagler

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    But the car was already on for a few seconds before I tried to activate the HVAC. And I couldn't reproduce it but just tapping the buttons.


    iPhone ?
     
    #3 trentofdestiny, Jul 15, 2019
  4. ChapmanF

    ChapmanF Senior Member

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    Just went out and tried it on mine. Seems to work if the two buttons are pressed any time within five seconds or so after powering the car on.
     
    #4 ChapmanF, Jul 16, 2019
  5. trentofdestiny

    trentofdestiny Master Finagler

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    I see. I will try it tomorrow as my car is outside rather than in the garage. Good to know though. Thanks! Does it exit the mode on its own?


    iPhone ?
     
    #5 trentofdestiny, Jul 16, 2019
  6. ChapmanF

    ChapmanF Senior Member

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    When you power the car off, or press the HVAC off button.
     
    #6 ChapmanF, Jul 16, 2019
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