Heater fan starts running when car is off for a long time...

Discussion in 'Gen 2 Prius Technical Discussion' started by InLoveWithMyPrius, Nov 23, 2021.

  1. InLoveWithMyPrius

    InLoveWithMyPrius New Member

    Joined:
    Nov 23, 2021
    3
    0
    0
    Location:
    New Zealand
    Vehicle:
    2009 Prius
    Model:
    i-Tech
    Hi there... I think I've seen various similar things posted about this, but I've yet to find one that is the same. Basically, my Prius starts it's heater all on its own after I've gotten home. Later I will go out into the driveway, and here it is... just blowing away. I turn the car on, make sure all A/C switches etc are off and it stops, then hours later (could be sooner but it's not until I go out there) there it goes again. When I got in it yesterday morning, the traction battery was very low and beeping at me. Please don't tell me that I need a new one of those batteries?!?!
     
  2. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    5,797
    3,093
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    Are you sure the car is actually switched off? I. e. do you notice if the MFD (screen in the centre) is off?

    Do you notice that the dash with the speedo and fuel gauge fails at all, i. e goes dark?
     
    InLoveWithMyPrius likes this.
  3. Another

    Another Active Member

    Joined:
    Jun 22, 2021
    571
    122
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    Sounds like it’s in Park Ready mode
     
    InLoveWithMyPrius likes this.
  4. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,662
    10,291
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    It is not uncommon for people to ask questions about the evaporative emissions self test, which happens several hours after the car is parked. The fan that runs during the test is not really the heater fan, it is a separate one closer to the fuel tank.

    If you are positive it's really the heater fan under the dash, then you have something very odd going on. The traction battery contains relays that disconnect it completely whenever the car is not in READY state, so nothing that happens while the car is off can deplete the traction battery.

    You mentioned a beep warning. Can you give any more description? Have you pulled any trouble codes?
     
    InLoveWithMyPrius likes this.
  5. InLoveWithMyPrius

    InLoveWithMyPrius New Member

    Joined:
    Nov 23, 2021
    3
    0
    0
    Location:
    New Zealand
    Vehicle:
    2009 Prius
    Model:
    i-Tech
    I put it in N position... I don't seem to be able to get to P. Footbrake on, all things switched off like heat/air conditioner.... then push the turn off button. There still seems to be some things on the dash, not sure without looking. I'll try and take a photo and post here.
     
  6. InLoveWithMyPrius

    InLoveWithMyPrius New Member

    Joined:
    Nov 23, 2021
    3
    0
    0
    Location:
    New Zealand
    Vehicle:
    2009 Prius
    Model:
    i-Tech
    Hhhmmm... I only thought it was the heater fan as air is blowing out of the vents above the navigation screen. :-\ Is this part of that test?
     
  7. Another

    Another Active Member

    Joined:
    Jun 22, 2021
    571
    122
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    If dashboard lights like transmission position are on, the car is not off.
     
  8. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    5,797
    3,093
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    Try pressing and holding the 'OFF' button for 5-10 seconds and see if it finally turns off.
     
    SFO likes this.
  9. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,756
    42,974
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    if you can't put it in park, that's the crux of the problem. any trouble lites?
     
  10. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    1,097
    449
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    I had read about something like this years ago. Some Gen2 Prius could have a failure where the car could not shift into park- some thought it was a bad shifter or button on the dashboard while others mentioned the park motor on the transmission. I would not be able to know without someone scanning the car for codes.

    If the car isn't in park, it will beep at you - and the high voltage battery can't charge while in neutral. If there is some fault in the park mechanism, you will want to set the parking brake so the car won't roll away. Also, if the car cannot go into park for some reason, then the engine won't start.

    I don't know if this is what is happening to YOUR car.

    Posted via the PriusChat mobile app.
     
  11. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,662
    10,291
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    If I remember right, failure to power off can also be a symptom of the combination meter capacitor issue.
     
  12. Another

    Another Active Member

    Joined:
    Jun 22, 2021
    571
    122
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    Shift lock solenoid failure?
     
  13. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,662
    10,291
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    2003 was the last Prius year to have a shift lock solenoid.
     
  14. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    94,756
    42,974
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    can the combo meter be bad without exhibiting any display symptoms?
     
  15. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    5,797
    3,093
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    We don't know that it doesn't and remember that aspect is intermittent at the start.

    I asked the question, but it was not answered. Or maybe it has and we can't see it due to the poster being moderated.
     
  16. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    1,097
    449
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Could be that, but I don't know that a CM problem would prevent the car from engaging park? (I'm assuming that the OP is attempting to use the park button instead just trying to power off).

    Posted via the PriusChat mobile app.
     
  17. Another

    Another Active Member

    Joined:
    Jun 22, 2021
    571
    122
    0
    Location:
    Naples, Florida
    Vehicle:
    2007 Prius
    Model:
    Touring
    What did they replace it with?
     
  18. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    14,662
    10,291
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Nothing. No Gen 2 or later Prius has a shifter that locks. They're just little joysticks you can waggle around.

    Come to think of it, Prius c does have a more traditional shifter. It's possible they've got a shift lock solenoid in that one.
     
Loading...