Turn off, on, off again without opening door causes beeping that drains battery in under an hour.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Shekibobo, Apr 7, 2018.

  1. Shekibobo

    Shekibobo Junior Member

    Joined:
    Feb 19, 2012
    8
    2
    0
    Location:
    Michigan, USA
    Vehicle:
    2009 Prius
    Model:
    N/A
    Original post was this, but was inaccurate and I can't figure out how to edit it:

    Beeping if opening and closing door more than once after car is off. Drains battery. | PriusChat

    I have a 2009 Prius with a remote key fob, but this is a problem with my auto unlock key and my wife's which only works with the buttons.

    When I park and shut off my car, then turn it on again, then shut it off again, the car will start beeping rapidly when the door opens like it's reminding me to take the key out. When this happens, it will drain the 12v battery in under an hour. I've had to jumpstart several times because of this. The main battery seems fine once I jumpstart.

    The only way to make the beeping stop seems to be to put the car in gear, drive a little (might just need to release the brake), then push the park button, then turn it off again.

    I need to know what is causing the beeping to happen and what makes that drain the battery. I've had my wife stranded with our toddler in the winter with no power to the car and need to make sure it never happens again.
     
  2. Lucifer

    Lucifer Senior Member

    Joined:
    Aug 23, 2015
    1,011
    479
    0
    Location:
    Nh
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    Do you have any aftermarket security devices or a remote car starter or sign of rodents inside the car.

    this shouldn't be in the prime section, not that that matters.

    So you press the start button and the car stops.... it's off.
    Then you start the car, are you putting it in ready or acc.
    If acc, then maby you're not then turning it off.
    Are you using the origional 12 v battery, if so it's time for a new one.
    If your 12v has gone ded several times it should be checked, possibl replaced.
    It's always a good idea to trikle charge the 12 v for a day once a month, keep it topped up.
     
  3. Shekibobo

    Shekibobo Junior Member

    Joined:
    Feb 19, 2012
    8
    2
    0
    Location:
    Michigan, USA
    Vehicle:
    2009 Prius
    Model:
    N/A
    Not seeing any sign of rodents. Always power on with my foot on the brake, so it's not in ACC mode. I did the diagnostic screen and it shows the battery at about 9V, so it's probably time to replace it. But still don't want this random thing draining a new battery all the time either.

    Also, didn't realize I was in the plug in section How do I move the post?
     
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    85,467
    37,678
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    click 'report' under that post and ask a mod, they will take care of it.

    it is possible that a new 12v will cure the problem. you won't know until you try. there is no other option, other than a temporary battery for testing, if you can borrow one.
     
  5. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    2,588
    1,160
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    First, you can't edit a post after someone has replied......or after a set amount of time has passed. Otherwise, you will see a "button" at the bottom for "edit".

    Then......some things just NEED a professional consultation.

    If you can reproduce this strange beeping at will, then a dealer service visit might be in order so they can find out what is causing it.
    It might even be something simple and the explanation will cost you nothing.......but don't hold your breath on that one.
     
  6. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

    Joined:
    Oct 17, 2010
    37,669
    26,470
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    How old is the current 12 volt battery; how many years have you had it?
     
  7. Shekibobo

    Shekibobo Junior Member

    Joined:
    Feb 19, 2012
    8
    2
    0
    Location:
    Michigan, USA
    Vehicle:
    2009 Prius
    Model:
    N/A
    Had the car since 2011 at 74k miles, it's at 211k now. So it's at least that old.
     
  8. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    2,671
    3,144
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    Install a new 12v battery. It is most likely the original. 12v batteries are supposed to be 12v batteries, not 9 volt batteries.
     
    scona, fotomoto and SFO like this.
  9. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

    Joined:
    Oct 17, 2010
    37,669
    26,470
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Oh, it's time. I'd speculate the fob oddities were caused by an already ailing 12 volt, not the other way around.

    You could test for "phantom loads", something constantly draining. You'd do that by putting a meter in milliampere mode in series on the negative side of the 12 volt battery. At rest, the car should be showing maybe 20 milliamps. Grossly higher would indicated something causing a serious drain.

    But all considered, I'd put my money on a new battery.
     
    scona likes this.
  10. Patrick Wong

    Patrick Wong DIY Enthusiast

    Joined:
    Mar 8, 2008
    18,086
    6,065
    0
    Location:
    Green Valley, AZ
    Vehicle:
    2015 Prius
    Model:
    Two
    1. Install a new 12V battery.
    2. Check for abnormal quiescent current draw when the car is IG-OFF.
    3. It is hard to ensure perfect reliability when the car has logged 211K miles so you may need to get a newer vehicle for your wife.
     
  11. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    2,588
    1,160
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    +4
    (or is it 5)
    The odds of one continuing to be healthy after 7 years are really small.
     
    scona likes this.
  12. Janell Spiecha

    Janell Spiecha New Member

    Joined:
    Dec 18, 2018
    1
    0
    0
    Location:
    USA
    Vehicle:
    2008 Prius
    Model:
    IV
    This happens to me once or twice a year. I am almost on first name basis with AAA by now. I'm convinced it is a computer bug and is not related to the health of the 12v battery. I have 205K on my car and the original 12v battery. It does not go dead randomly. It happens so often that I have looked at buying and keeping one of those "jump start" boxes in my car that the tow truck guys use.

    I think it is caused by some combination of the order in which I put the car in park, turn off the lights and open the door. Some ordering of those events causes some device to stay on that I can't see that drains the battery. Who knows -- tire pressure sensor or fuel level sensor or the system that figures out if your keys are still in the car so you don't lock yourself out. It always jump starts just fine and is fine until the next time.

    I have learned that if the car beeps at me (with the actual horn) or the "door open" sound dings after I have turned it off and exited the vehicle, that is my clue that something is left on. You would think that getting back in, turning it all the way back on with the brake pedal engaged and turning back off would fix it. It does not. I usually have to engage it in drive (or reverse) and then park it again.

    If anyone can shed light on that magic sequence of events so I can avoid it or provide a better solution than driving around the block to fix it, I'd be grateful.
     
  13. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    85,467
    37,678
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    why would you possibly think a 10 year old battery is fine?

    if it were a software bug, it would have been happening for ten years
     
  14. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    2,671
    3,144
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    Janell,

    If memory serves me correctly.......

    Always turn off your car before opening the door, especially if the headlights are on. If you open the door first, the lights will not AUTO-OFF.
    Of course, this issue can be eliminated if you just develop the habit of always turning the headlights off manually.
     
  15. Shekibobo

    Shekibobo Junior Member

    Joined:
    Feb 19, 2012
    8
    2
    0
    Location:
    Michigan, USA
    Vehicle:
    2009 Prius
    Model:
    N/A
    I ended up replacing the 12v battery and haven't had any problems since.
     
    Raytheeagle and scona like this.
  16. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    85,467
    37,678
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    excellent!(y)
     
  17. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

    Joined:
    Oct 17, 2010
    37,669
    26,470
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    @bisco you just applauded yourself?
     
  18. padroo

    padroo Senior Member

    Joined:
    Jan 11, 2008
    2,762
    2,220
    13
    Location:
    Chesterton, Indiana Another third world country.
    Vehicle:
    2016 Prius
    Model:
    Four

    He's like that. :D
     
  19. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    9,598
    12,995
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Probably the only satisfaction he gets as he can’t “like” his own posts:LOL:.
     
  20. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    85,467
    37,678
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    but i'm working on it :sneaky:
     
Loading...