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Dash still failing

Discussion in 'Gen 2 Prius Technical Discussion' started by Gus07, Apr 12, 2018.

  1. Gus07

    Gus07 New Member

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    Hello. Just replaced my 12V battery and second time I turn the car on the dash / speedometer didn’t turn on. Super bummed hoped the battery would fix this. What’s next?
     
    #1 Gus07, Apr 12, 2018
  2. bisco

    bisco cookie crumbler

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    test the battery, sometimes they are bad. also, the battery connections are important, especially the negative to ground. if not, probably the combo meter.
     
    #2 bisco, Apr 12, 2018
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  3. jerrymildred

    jerrymildred Senior Member

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    +1
     
    #3 jerrymildred, Apr 12, 2018
  4. Gus07

    Gus07 New Member

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    I’ll test and report back. Checking from the car it said 12.1V Thanks bisco.
     
    #4 Gus07, Apr 12, 2018
  5. Erik Owens

    Erik Owens Member

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    COMBO METER ECU. COMMON ISSUE.
     
    #5 Erik Owens, Apr 12, 2018
  6. Gus07

    Gus07 New Member

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    Yuck! That’s a long replacement. I’ll try it if I gotta!
     
    #6 Gus07, Apr 12, 2018
  7. bisco

    bisco cookie crumbler

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    12.1 idead for a new battery, and low for an old one.
     
    #7 bisco, Apr 12, 2018
  8. Gus07

    Gus07 New Member

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    What the????? Geezzzz rotten luck with this. I have some free time tomorrow I’ll have the shop I bought it at test it.
     
    #8 Gus07, Apr 12, 2018
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  9. bisco

    bisco cookie crumbler

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    sometimes they sit around for a bit, and should be charged before installing.
     
    #9 bisco, Apr 12, 2018
  10. Gus07

    Gus07 New Member

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    After driving 20ish miles this morning it’s reading 13.9. But I’m stuck in my drive way because it won’t turn off... Does replacing the Combo meter fix this as well?
     
    #10 Gus07, Apr 13, 2018
  11. Gus07

    Gus07 New Member

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    Just pushed the power button and it decided to turn off. Happy Friday.
     
    #11 Gus07, Apr 13, 2018
  12. Gus07

    Gus07 New Member

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    This guy says it’s just a soldering job / replacing a bad capacitor. Is this all the repair guys do if I were to ship it out?

     
    #12 Gus07, Apr 13, 2018
  13. Gus07

    Gus07 New Member

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    Update: new Combo Meter was installed today. Took me 2-3 hours total while juggling my 5 yr old.

    Shout out to Matt at Texas Hybrid for the replacement board. Worked right away!

    Until next issue, take care all!

    Gus07
     
    #13 Gus07, Apr 22, 2018
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  14. iduncan

    iduncan Junior Member

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    Yep. Replacing the capacitors is all it takes. All capacitors have a finite lifespan, especially aluminum SMD caps. Just replace all 3 while you are there. I've fixed a few of these, after I fixed my personal car last year. Of course de soldering the old caps without lifting a pad can be tricky without a hot air reflow machine. I use 2 soldering irons, one to heat each pad simultaneously. Then when the solder is molten & the cap is loose I flip it to the side with the irons. I clean up the pads with solder wick, & I use solder paste with flux to solder the new caps on. The combo meter mileage does not need to be reprogrammed when it goes back into the same car it came out of.

    I took the time to locate caps that are correct form factor, & rated for the longest lifespan at high temps I could find. They are rated to 3000 hours at 105C IIRC. The original caps were only rated for 1000 hours at 105C. Theoretically mine will last three times as long as original. Of course the less time the car spends parked in the sun, the longer the combo meter will last...
     
    #14 iduncan, Apr 25, 2018
    Last edited: Apr 25, 2018
  15. edthefox5

    edthefox5 Senior Member

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    You don’t unsolder SMD caps to remove them. That’s unnecessary heat on the pads. And flux is not necessary either.

    Just grab them with a needle nose and rock them back and forth a few times and the feet break off the cap.
    Takes about 3 seconds.
     
    #15 edthefox5, May 1, 2018
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