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Dash Lights ON in Cold

Discussion in 'Gen 2 Prius Main Forum' started by castironandbutter, Jan 4, 2018.

  1. castironandbutter

    castironandbutter Junior Member

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    I started my 2004 Prius in -9F weather and these lights came on. The car functioned fine and continues to (albeit with the lights on). I ordered a VCI and am waiting on it to arrive but another tool came up with no codes.

    Separately, my fuel economy has dropped into the mid to high 30's more often than not. I'm pretty sure I'm in the beginning stages of HV battery failure. Just though that could be useful.
     

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  2. kenoarto

    kenoarto Senior Member

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    12v battery check says?
     
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  3. bisco

    bisco cookie crumbler

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    how many miles on her?
     
  4. castironandbutter

    castironandbutter Junior Member

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    128,000
     
  5. castironandbutter

    castironandbutter Junior Member

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    I put an optima yellow top agm in last year. you still think it needs checking?
     
  6. bisco

    bisco cookie crumbler

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    i think you would get the red triangle if it were battery related.

    always worth testing the 12v, especially at nine below.:barefoot:
     
  7. castironandbutter

    castironandbutter Junior Member

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    okie dokie, thanks folks! I'll post an update after I check.
     
  8. bisco

    bisco cookie crumbler

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    also, maybe a frozen brake caliper or something in the wheel area set the lights off.
     
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  9. castironandbutter

    castironandbutter Junior Member

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    Ok, so I tried real hard to make that techstream work but I don't have windows 7 or 8 or xp and it's been a no go. And even my pal who is a firmware engineer in silicon valley couldntc figure it out...so i finally broke down and got a scanguage2. And guess what?? No codes! Brake, maintenance reqd, air pressure, ABS, and VSC all still on even after force clearing. Is the scan guage supposed to be able to read codes for Prius?
     
  10. dolj

    dolj Senior Member

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    Your pal should be able to find a cheap used laptop with Win 7 installed. Buy that and he will be able to install the interface cable and s/w no problem.
    You might be better to post a question in the Gen 2 accessories forum and ask specifically about the ScanGauge.
     
  11. Erik Owens

    Erik Owens Member

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    Make sure you have the correct mongoose/ DLC cable. I hate to tell you that there are cheap cables out there that dont read. Either they will be clear or blue. Should be green and Mongoose brand.
     
  12. Erik Owens

    Erik Owens Member

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    Plus if your ABS lights are on your ABS actuator could be failing which is very common in that model. Ive replaced double digits over a year. Just a shot in teh dark since no codes but is that a piece of tape over your display in one spot? You will either hear a noise from the cowl engine bay area, or have poor braking, or the lights with codes. If your MPG are down check the engine performance as well as the HV Battery terminals at the cells. Corrssion is a sure sign and bet of degradation. Plus tires, spark plugs, etc could all cause low MPG.
    My experience as well is those Optima AGM are garbage. Some people have good luck but most I see cause more issues than solve after a temperature shock in hot or cold. Good searching.
     
  13. dolj

    dolj Senior Member

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    There are better options than Mini VCI that are cheaper than the Mongoose. While I don't disagree with your assessment, most people cannot/will not spring for the ~$500 it costs for real McCoy, just to do the occasional scan. While you get what you pay for, most of the cheap cables work for reading the ECUs, even if you have to buy 3 or 4 to get one that works satisfactorily.

    Also be aware of vendors selling "Genuine Mongoose" that are cheap. They are cheap because that are counterfeit, so make sure, if buying a mongoose, you buy from a reputable supplier.

    Be also aware and wary of the cheap rubbish Mangoose counterfeits.
     
  14. Erik Owens

    Erik Owens Member

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    You are right totally correct. I would go to a shop that reads codes and has a Techstream. Reading codes should be free. THey may hassle you to fix it with them but that is your choice and sadly the warranty enhancement for the brake actuator is done if that is the issue.
     
  15. castironandbutter

    castironandbutter Junior Member

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    Thanks y'all! And yes! I'm short so the red triangle of doom is right in my line of sight, so I covered it up! That's for the headlight leveling sensor (pins are corroded and broken)...which if anyone has any recommendations...or really a link to exactly what I should buy on ebay or wherever, that would be fantastic. And in regards to headlight leveling sensor. My headlights seem to freak out and sometimes flicker and sometimes one won't work (and once both didn't work in the middle of the night). Does that seem related?

    And for sure, my HV battery is degraded. I have the prolong system and have done a full cycle with it. Definitely some improvement. But even with the 12V disconnected for a long time during installation, lights are still on. I hear what you're saying about the brake actuator but my brakes seem to be alright (although sometimes I feel like my coasting slows me down really fast even for regenerative braking). I just don't know why all the lights would come on at once. That makes me think there wasn't a real problem, just a glitch that happened in the cold. At least regarding the lights.
     
  16. Erik Owens

    Erik Owens Member

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    Ill take that anyday. Good job.
     
  17. dolj

    dolj Senior Member

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    It very well might not be the actuator, but you could have brake drag for some reason.

    While postulating based on experience or intuition is tempting, a good diagnostician will always read the codes and add that to the mix of symptoms and reported behaviour.

    Seen it too many times where someone, even a licensed ASE mechanic, throws out a "it is probably ..., seen it many times," only for it to be something totally different.

    The only thing you know for sure with the ABS light on, is the ABS ECU has one or more codes stored. Read the codes and then at least the direction for fixing the problem becomes more focused. Therefore, I encourage you once again to get your J2534 cable installed and running.

    If you bought one of the really cheap Mini VCI cables, you may need to consider it is defective, if you or your pal cannot get it working with Techstream. Just buy another, or buy a better quality option like VxDiag nano for Toyota or Tactrix OpenPort 2.0 For Techstream. The latter is a USA designed and built, if you care to support local industry. There is of course the Mongoose as well. With the last three options, please be careful to buy the genuine product, as there are counterfeits of them all. Caveat emptor.
     
    #17 dolj, Mar 29, 2018
    Last edited: Mar 29, 2018
  18. Erik Owens

    Erik Owens Member

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    Its ASE. You need to postulate better.
     
  19. castironandbutter

    castironandbutter Junior Member

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    For the record, advance auto read the code but Auto zone could not. It's C1343. Malfunction in hydraulic system (right rear). I had a local mechanic do my brakes back before this started...but at least 550 miles before it threw this code because I drove from Pittsburgh to VT after that. There is another thread that explains what to do so I'll see what happens after I attempt that.
     
  20. castironandbutter

    castironandbutter Junior Member

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    Also, is this snarkiness??