1. Raymond Bennett

    Raymond Bennett New Member

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    Location:
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    Vehicle:
    2009 Prius
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    II
    My Prius (2009, 190150 miles) won't turn on when I hit the power button whether the brake pedal is depressed or not. The key fob will not unlock the doors from the outside, and the car will not turn on whether the key fob is inserted or not. The door lock/unlock button on the driver's side won't work and the trunk will not open with the Smart Key. Is this a battery problem/fuse problem/ etc?
     
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Location:
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    Vehicle:
    2015 Prius
    Model:
    Two
    Turn on the headlights. Are they bright? If not, that is a good sign the 12V battery needs to be replaced or at minimum charged.

    If you decide the battery needs to be replaced, you can open the hatch by crawling into the hatch area, removing the folding hatch floor, then removing the small access panel in the black plastic tray above the spare tire, facing the rear of the vehicle. Then you will have access to the mechanical hatch release which is a shiny lever. Move that lever and apply upwards pressure on the hatch to open.
     
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  3. padroo

    padroo Senior Member

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    Chesterton, Indiana Another third world country.
    Vehicle:
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    Model:
    Four
    Anytime a Prius starts acting stupid check the 12 battery.
     
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  4. JimN

    JimN Let the games begin!

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    I'd pop the hood and attach 12v power to the jump point before crawling through the car to pop the hatch.
     
  5. Raymond Bennett

    Raymond Bennett New Member

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    2009 Prius
    Model:
    II
    The car dashboard doesn't even turn on when I hit the power button. Would the lights still turn on even with that?
     
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Yes if the 12V battery is charged.
     
  7. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    Location:
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    One possibility is a blown AM2 fuse caused by a shorted inverter coolant pump. The fuse box is under the hood next to the drivers fender.
     
  8. sam spade 2

    sam spade 2 Senior Member

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    It sounds like you are saying that NOTHING electrical works.....including the dome lights ??

    It is a bit unusual for a 12 V battery to go totally DEAD all at once but loose battery cables can cause that.

    Then.....if it still has the original factory battery, you are WAY overdue for a new one, even if it turns out that is not the current problem.
     
  9. edthefox5

    edthefox5 Senior Member

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    Location:
    Clearwater, Florida
    Vehicle:
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    Two
    12 volt dead pretty common. Usually caused by leaving the interior overhead light on all night or the hatch is not closed and there’s a light back there. There’s a hatch light switch in the back on the side wall.
    I keep mine turned off.
    Have to crawl in the back and pull the mechanical emergency hatch release lever.
    Replace the 12 volt battery. Don’t bother having it tested usually when it’s so
    Perfectly discharged by a light bulb it causes sulphation and will be troublesome and leave you stranded.

    Replace the 12 volt and pay attention to the lights when leaving the car overnight.
     
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