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Is my battery dead? Or are my doors malfunctioning?

Discussion in 'Gen 2 Prius Technical Discussion' started by Melisande, Aug 3, 2021.

  1. Melisande

    Melisande Junior Member

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    2007 Prius
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    Yesterday, I tried using my electronic key to open my Prius 2007 … as I usually do. However, the door wouldn’t open. I thought maybe the battery was dying on my key fob, so I tried my husband’s key and his didn’t work either. Couldn’t get the doors open with either electronic key. My Prius tends to lose its charge and need a jump start if I don’t drive it for a few weeks (like when we come back after a long vacation). So my husband jumped to the conclusion that it needed a jump start. I told him that I didn’t think that was true because I have been driving my car normally. Ok, I didn’t drive it over the weekend, but that’s pretty much normal.

    So, I tried opening the door with the physical key that is embedded inside the key fob. And I couldn’t get the door open with that key either. It turned in the lock but the door didn’t open. There’s is only one physical lock on the car and that is (obviously) the one I tried. I have used the physical key in the past and had no problems then, so …

    My husband is still insisting that we need to call for a jump start, but I am thinking that it is a door issue. But does that happen? Could the doors fail like that somehow?

    Ideas?

    Actually, what I am a little concerned about it that my husband wants to jump start the car himself using our other Prius (and in fact just went out to buy jumper cables). But I have read that jump starting Prii is not as straightforward as jump starting other cars, although I am not sure how it is different. Also, my husband and I must rank among the least talented DYieds on the planet. Not handy AT ALL.

    So, I don’t want him to attempt to jump start it (and potentially screw up) particularly if that is not the actual problem.
     
  2. Melisande

    Melisande Junior Member

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    Ok, we did get the door open and it appears to be the battery. Going to start a different thread ….
     
  3. Melisande

    Melisande Junior Member

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    Why is my 2007 Prius repeatedly refusing to start? This is the second time this has happened this summer so far. In the past it happened when I don’t drive the car for a long time (two weeks or more). But this last time, I only let it sit for two days and the battery apparently recharged anyway. After the previous incidents I brought the car to the dealership and they couldn’t find anything wrong with it a couple of times. But a couple of years ago, they did replace some of the cells in the battery,

    Should I try to get this fixed again? Or just give up on the car? Is it normal for the car to not start after two weeks in the garage? Obviously, it is not normal that it won’t start after just one weekend. But I feel weary about this. Getting it jump started again. Driving it to the dealership again and either 1) having them find nothing wrong again or 2) having them replace some cells in the battery, then still having the battery die whenever it is left too long.
     
  4. bisco

    bisco cookie crumbler

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    there are 2 batteries in the car. a regular 12 volt like evry car, but it only boots the computers and closes relays, and the hybrid 'drive' battery, which starts the engine, and helps to propel the car.
    depending on what you mean by 'start', it could be the 12 volt battery, hybrid battery, or something else.
    going by your description of doors not unlocking, and needing a jump start, it sounds like you need a new 12 volt battery.
    you could try charging it first, how old is it?

    replaced cells in the hybrid battery is a whole 'nuther thing. if that goes bad, you will get a bunch of warning lights on the dash, including the red triangle of death.
     
    #4 bisco, Aug 3, 2021
    Last edited: Aug 3, 2021
  5. dolj

    dolj Senior Member

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    Hi and welcome to PriusChat.
    This use case is by way the most common way to shorten the life span of the 12 V battery. It very much sounds like your current 12 V battery is no longer able to hold a charge which means it is time to replace it.
    It is not obvious at all, given that it sounds like your current 12 V battery is due for replacement. When the battery is not holding a charge short infrequent drives will not charge it and what little charge gets in there can disappear overnight.
    This is obviously not a proper Toyota dealership as they wouldn't "replace some cells" unless one of the techs was doing it as a side hustle.

    I hope this helps, and all the best.
     
  6. Another

    Another Senior Member

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    If you routinely don’t use the Prius for two weeks at a time, get a plug in maintenance charger or a window mounted solar maintenance charger either of which will keep the 12v battery topped off. The plug in is $20, the solar a bit more.
    Could also be that your 12v is in need of replacement. How old is it?
     
  7. edthefox5

    edthefox5 Senior Member

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    Tiny little battery and it’s years old. Deplete it really good to zero volts by leaving a light on which continues for hours holding it at zero volts just once and it will never be the same. It’s damaged and should have been replaced the first time it went dead.