2010 Prius: Intermittent Dash Lights & No Regen Braking

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by myselfnjit, May 16, 2023.

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  1. myselfnjit

    myselfnjit Junior Member

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    Thanks for the reply!
    If I am reading the link about the repair manual correctly, it says I need to find the Chilton through local library or buy 2 days from Toyota and work fast. Does that sound right or am I missing an option here?
     
    #41 myselfnjit, Mar 2, 2025
  2. MAX2

    MAX2 Senior Member

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    Have you identified the error codes that led to your forum post?
     
    #42 MAX2, Mar 2, 2025
  3. myselfnjit

    myselfnjit Junior Member

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    Yes. 33,34, 38 and 39. Which seems to point to both rear ABS sensors. But, as noted prior, one was replaced recently and it seems strange that they would now both pop up at the same time leaving me to wonder if there is an issue with whatever area where they are wired together.
     
    #43 myselfnjit, Mar 3, 2025
  4. myselfnjit

    myselfnjit Junior Member

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    I'm looking for any more advice on this one...
    I can't seem to find any decent service manuals that would tell me how to trouble shoot this .
    I did pull the rear wheels to get a better look at the speed sensor connector s and wires and they look fine. Being that both sides came up as issues at the same time, I am a little dubious as to is being the actual sensors.
    Thoughts?
     
    #44 myselfnjit, Mar 26, 2025
  5. Brian1954

    Brian1954 Senior Member

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    Read post #40. You need to get the Toyota repair manual for the codes that you have and go through the step by step process of troubleshooting how to diagnose the problem.
     
    #45 Brian1954, Mar 26, 2025
  6. myselfnjit

    myselfnjit Junior Member

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    Thanks for the reply.
    I did see that post and click the link but fail to find usable documentation. Does this mean I need to purchase the Toyota repair manual for the 2 days or am I missing something? Sorry for my ignorance here. I have always been able to either find a physical repair book or followed Internet advice to track down the issues.
     
    #46 myselfnjit, Mar 26, 2025
  7. Brian1954

    Brian1954 Senior Member

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    Yes, you should pay for two days of access to the Toyota information system. Download the needed sections of the Toyota repair manual. You will need to create an account to do this.
     
    #47 Brian1954, Mar 26, 2025
  8. myselfnjit

    myselfnjit Junior Member

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    Downloadable! That's exactly what I needed to hear. Thanks!
     
    #48 myselfnjit, Mar 28, 2025
  9. myselfnjit

    myselfnjit Junior Member

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    Well I looked up my AutoZone account and found I had a warranty on the replaced rear wheel bearing so I decided to replace both rears. While I was in there I unhooked both ends of both sensor harnesses and tested the wires for continuity. Both good.
    After replacing both I went for a drive and restarted the car a dozen times. Still get lights. Came back home and checked blink codes. Now the only one of note is the ABS 33. I'm at a bit of a loss here...
     
    #49 myselfnjit, Mar 30, 2025
  10. myselfnjit

    myselfnjit Junior Member

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    Well I took off that right wheel and pulled the sensor connector and sprayed it a few times with some deoxit then ran it on and off of the sensor a few times. Clipped it back on and put everything back together and no lights! Guess it was just a little dirty in there. Will update if there are any changes but good for now. Thanks for the help.
     
    #50 myselfnjit, Mar 30, 2025
  11. ChapmanF

    ChapmanF Senior Member

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    The brake system has a 'sensor test' mode you can put it in, where you drive around in a certain prescribed fashion and it holds the sensor signals to extra-high standards, and signals if anything is remotely marginal.

    The repair manual says to use that test after any kind of work on the bearings or around those sensors, and that's not a bad idea, because if you run through that routine and everything passes, you can be pretty sure it's all good.
     
    #51 ChapmanF, Mar 30, 2025
  12. myselfnjit

    myselfnjit Junior Member

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    Well it has been good all week but just in case... Do you have any directions on how to get it into sensor test mode? I would love to give it a shot.
     
    #52 myselfnjit, Apr 5, 2025
  13. ChapmanF

    ChapmanF Senior Member

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    Someone might pop by and post an excerpt from the repair manual, if not, of course it's here:

    Toyota Service Information and Where To Find It | PriusChat

    It's a whole procedure: enter the mode, drive this way at this speed, make this kind of U turn, hold pedals this long, wait for beeps ... better to read it in the manual, too long for me to type and risk getting a detail off.
     
    #53 ChapmanF, Apr 5, 2025
  14. Mendel Leisk

    Mendel Leisk MMX GEN III

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    FYI chap, I'm not seeing "sensor test" in my copy. Could it be slightly different?
     
    #54 Mendel Leisk, Apr 5, 2025
  15. ChapmanF

    ChapmanF Senior Member

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    Um, SIGNAL CHECK or SENSOR CHECK USING TEST MODE ...

    ... in using or not using the Techstream flavors.
     
    #55 ChapmanF, Apr 5, 2025
  16. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Found, thanks. :)
     
    #56 Mendel Leisk, Apr 5, 2025
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