New 12 volt battery- Problem after Touch screen replacement.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Paul Schenck, Nov 14, 2022.

  1. Paul Schenck

    Paul Schenck Active Member

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    Recently replaced a Touch screen model# BT003A from a 2006 into a 2009.
    Which went well up until restarting the car.
    It seemed the battery had been drained. I jumped the car and all seemed well on the test drive and multiple restarts.
    Next day I get a call from my wife needing a jump. And again everything is fine until a couple of starts later. I asume it’s time for a new battery so I replace it. And of course everything checks out and works well over the weekend though come Monday after she drives to work and goes to open the rear hatch to take her supplies out, nothing!!!
    I went by today and didn’t feel like crawling into the trunk to check the battery with a multi meter I jumped it. And used the code reader seeing 13.2 volts at the obd plug. No codes either.
    What am I missing here???


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    #1 Paul Schenck, Nov 14, 2022
  2. mr_guy_mann

    mr_guy_mann Senior Member

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    IF the car does not power on AND the battery voltage is "good" (12.6V or more), then I would test voltage at the under hood fuse box to see if there is a poor connection somewhere between them.

    If you have good voltage readings then my first GUESS is that the Combination Meter (speedometer) has a bad capacitor and won't work correctly.

    Read the sticky thread "combination meter repair - DIY" at the top of this forum.

    Posted via the PriusChat mobile app.
     
    #2 mr_guy_mann, Nov 14, 2022
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  3. Tombukt2

    Tombukt2 Senior Member

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    The touch screen from 06 early to 09
    Touch screen meaning MFD center dash so 04 to 06 MFD ugs up in 09? Or moving parts? You've put the 600K on this car,?? What was original MFD issue?
     
    #3 Tombukt2, Nov 15, 2022
  4. Paul Schenck

    Paul Schenck Active Member

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    Hey Tom, My 2005 Prius has 600 K, my wife’s 2009 90K is the one I replaced the 7 button touchscreen on with one I removed from my salvaged 2006 I use for parts. I’ve never had a new battery fail immediately upon exiting the car before.
    Though I figured it out. I rechecked my installation of the Battery looking for something loose and found it. It was the bolt connecting the Negative cable to the chassis some fool had not tightened it down. So the touch screen had nothing to do with it. The old battery from 2014 just happened to need replacing, though maybe that’s why the screen went out? Hmmm.


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    #4 Paul Schenck, Nov 15, 2022
  5. Paul Schenck

    Paul Schenck Active Member

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    Hey Mr Guy; you were right. It was a loose chassis connection. The fool that installed it got distracted and didn’t tighten the 10mm bolt, a few bumps on the road and the door closing was enough to make it loose it ground connection.


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    #5 Paul Schenck, Nov 15, 2022
  6. cyberpriusII

    cyberpriusII Prodigyplace says I'm Super Kris

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    There are a fair chunk of posts on here that eventually come down to loose negative connection.

    What's up with that....My only guess is that everyone is so used to tightening the neg. cable on the battery and all done,,,,sort of forget the chassis connection.
     
    #6 cyberpriusII, Nov 15, 2022
  7. fotomoto

    fotomoto Senior Member

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    We once chased a similar issue here on PC for days. It turned out the OP failed to mention the rear of the vehicle had been repainted and the neg. cable bolt had been fastened down to the new paint creating a similar intermittent short.
     
    #7 fotomoto, Nov 15, 2022
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