Found water in the 12V auxiliary battery of the right side hatch compartment and where the...

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ana Hernandez, Mar 1, 2016.

  1. Ana Hernandez

    Ana Hernandez Junior Member

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    image.jpeg image.jpeg image.jpeg I have a concern has any experienced seeking water where the aux battery goes in the hatch compartment.? As well as where the emergency tire goes? I was taking the battery out this weekend to take it home and charge it, and I saw the flood of yellow water, how does this water get in the car?

    Another question/concern when reconnecting the battery in reverse the positive terminal connects first and then the negative but I was experiencing some sparks pointing my way, I was wearing my plastic/gummy gloves but is this normal should I worry?
    And what would happen if I forgot to reconnect the little black pump (the little hose that connects to the battery)? I think I did and keep smelling weird odors as if chemicals were being released.

    Anyway here are some pictures of the puddles in the truck/hatch compartment:
    I suspect for the tire area that the water gets in through the center hole in the middle of the tire.

    image.jpeg image.jpeg
     
    #1 Ana Hernandez, Mar 1, 2016
    Last edited by a moderator: Mar 1, 2016
  2. valde3

    valde3 Senior Member

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    You should reconnect the vent line to 12V battery. You can get rid off the water by pulling/pushing the rubber grommets of the floorboard. Then water will drain to ground. Plug can then be pushed back on. Problem is very likely the crack that you can see here Water leak...into spare tire area etc | Page 3 | PriusChat it also has instructions on how to fix it. Don’t just leave it since water can ruin your hybrid battery and also cause mildew and rust problems.
     
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  3. 48mpg

    48mpg Member

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    the water is coming from the roof seams...you have to remove the black rubber trim and use a clear silicone sealant and press the black rubber back into place, also there are black rubber body plugs in the battery area just push one out to get the water out...I sprayed mine with rubber under coat to prevent rust....common problem
     

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  4. edthefox5

    edthefox5 Senior Member

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    Sparks are unnecessary. On the assy that connects to the positive terminal are 2 power leads with plugs. One is a thick wire the main power lead the other is the 5 amp smaller lead. Both plug into the pos terminal assy. Just push the clips on the plug and pull them out. That disconnects the battery from the car electrically. Bolt it all in make sure the battery is not reversed and then plug in those 2 connectors back in.
    As far as the water yes you have a cabin leak. Pull the small rubber plug in the floor of the battery well. Let the water drain out. Get bucket of soapy water. Wash out the well good or it will smell.Before you put the rubber plug back in drill a small weep hole in it so if any more water leaks in it will drain. The water under the tire is from the leak also. Do the same to that plug.
     
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  5. Paul Schenck

    Paul Schenck Active Member

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    You mean I’ve been disconnecting the negative 10mm nut all this time when I could have been unplugging the positive?
    Just when you think you know something about a car someone makes a post on a forum and blows your mind!


    iPhone ?
     
  6. dolj

    dolj Senior Member

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    Yes.

    Not why not many people do not know this, it is not like it is top secret info.
     
  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Isn't disconnecting positive more risky? I don't have enough brain cells to discuss the pros and cons, just what I've heard.
     
  8. Dxta

    Dxta Senior Member

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    I prefer disconnecting the negative terminal, just in case.
     
  9. dolj

    dolj Senior Member

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    Disconnecting the negative first is a logical safety measure if you are disconnecting the battery to remove and replace. The reasoning is if you should inadvertently touch the wrench to the car body while working to remove the negative terminal clamp, nothing would happen as there would not be an electrical circuit created. However, doing the same on positive terminal (without first removing the negative connection) and accidentally touching your wrench to the car body will cause a closed circuit and a high current short with maybe some serious sparking. You could also damage something connected to the 12 V bus.

    If you are not doing anything where you are working on the positive terminal with a wrench, then there is not much of a risk of anything bad happening.

    As edthefox5 said above, if all you need to do is disconnect the 12 V for a few seconds/minutes just disconnect at the connector. No sparks. And no tools required.
     
    #9 dolj, Aug 22, 2018
    Last edited: Aug 22, 2018
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  10. valde3

    valde3 Senior Member

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    Main risk with disconnecting positive first is that if you have to use a wrench (like on most of cars) and it happens to touch some other metal part that’s a short circuit! If you don’t need tools risk is basically zero.

    Some cars even have factory quick disconnect on the positive terminal if battery is fitted so that you can’t access the negative terminal before battery is removed.
     
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  11. Dxta

    Dxta Senior Member

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    Great info here
     
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  12. Dxta

    Dxta Senior Member

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    Almost all of the gen2s I have worked on, have the water leak provme.s in their battery, and spare tire wells.

    .I have also noticed this same issues on Camry hybrid 2007/8/9 too.

    All these leaks appears to be factory related problems.

    I'm surprised, Toyota hasn't issued any "fixes" to the problems yet.
     
  13. dolj

    dolj Senior Member

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    First you have to acknowledge there is a problem. Same with the smelly HV battery vent tubes, no problem there either.
     
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