2009 Prius - ABS, VSC, Brake, and ! All turn on at startup

Discussion in 'Gen 2 Prius Technical Discussion' started by Brett Kowalczyk, Jan 31, 2021.

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  1. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Ok, I know lots of people seem to have this problem, and as far as I can tell, I've tried the obvious things (battery is 1-month old).

    I can park this car with not trouble lights on, and then start it the next morning and all of those lights come on at once!

    Looks like, since I'm new here, I can't past a link to the video...

    As far as I can tell they're flashing these codes, but I can't find much for these codes online;

    ABS: 33, 95, 5
    VSC: 43, 62, 63
    (!): 36

    Have Torque Pro and I've verified when it goes in this state, no regenerative braking happens, but the normal hydraulic brakes still work fine.

    Thoughts?
     
  2. app-o-matix

    app-o-matix New Member

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    Any possibility of obtaining Techstream software and a compatible hardware cable for more detailed diagnostics?
     
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  3. ChapmanF

    ChapmanF Senior Member

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    You find them in the repair manual (more info).

    They are listed after the five-character trouble code that a scan tool would show you, separated by a slash, something like Cxxxx/yy. As a shortcut, if you have a PDF of the manual and you search for a blink code yy with a slash in front, you will often be taken right there. It's important to scroll up and make sure you are in the brake section and the correct table, and the search hasn't matched a code for the tire monitor or whatever. If it did, just keep going to the next match.

    In the brake section, there are separate tables for codes from ABS, VSC, and ECB (the (!) light). Some of the blink codes can overlap, so you have to make sure you have found the code in the right table for the light that blinked it.

    You should re-check the code you wrote as '5' ... the blink codes are all two digits.
     
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  4. Brett Kowalczyk

    Brett Kowalczyk New Member

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    I've got to look into this. Is this a pc-based software?
     
  5. mr_guy_mann

    mr_guy_mann Senior Member

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    Look on amazon or ebay for "mini vci cable" that comes with techstream (a pirated copy of Toyota's diagnostic software)- usually installed on an old windows laptop.

    Posted via the PriusChat mobile app.
     
  6. app-o-matix

    app-o-matix New Member

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  7. ChapmanF

    ChapmanF Senior Member

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    Conveniently, the OP has already read the trouble codes.

    Except the one that came out '5'. But that could be rechecked pretty easily.

    There are all sorts of reasons a Techstream rig could be useful. But those codes could be looked up in the manual without waiting for a Techstream rig to arrive.
     
  8. Sean Easterly

    Sean Easterly New Member

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    Yo! I have an 09 Prius and am just now having this problem. My brakes actually aren’t working well when the lights come on, but they have only turned on once.

    I spoke with my mechanic friend, he said it is possibly due to the extreme cold we are facing.

    Another, more sinister and expensive, possibility is the brake actuator is failing. I did some online research and found this was a recall.

    I’m hoping once it warms up, our problems disappear! probably wishful thinking...
     
  9. Brett Kowalczyk

    Brett Kowalczyk New Member

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    It's actually my experience that it's only tied to cold weather. I've checked the abs relays and even left them in the freezer overnight, worked up in the morning, used our power supply for our Roku (12v ) and the relays all clicked just fine. Put them in the car and there was still am issue. So it's not the relays. So, on to the next thing...
     
  10. Brett Kowalczyk

    Brett Kowalczyk New Member

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  11. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Finally got my cable and disc in the mail! I'll be installing it shortly!!!!
     
  12. Brett Kowalczyk

    Brett Kowalczyk New Member

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    We finally have techstream codes!
     

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  13. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Also, uploading the detailed reports from those two trouble codes!
     

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  14. ChapmanF

    ChapmanF Senior Member

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    These codes confirm six of the ones reported a month and a half ago in post #1:

    • C0210 (blink code ABS 33)
    • U0124 (blink code 95)
    • blink code VSC 43: "hey, there is an ABS code"
    • U0123 (blink code VSC 62)
    • U0126 (blink code VSC 63)
    • blink code ((!)) 36: "hey, there is an ABS code"

    The blink code that was just "5" in post #1 never got reposted with the missing digit, so I'm not sure what that was. (It wasn't the C1253 ... that corresponds to a "53" blink code but on the ((!)) light, not the ABS.)

    These codes reported by Techstream seem to have come later, since their blink codes were not listed in post #1. It would make sense for them to crop up together, being related to relays:

    • C1311 (blink code ((!)) 11)
    • C1313 (blink code ((!)) 13)
    • C1253 (blink code ((!)) 53)
    • C1300 (this has no blink code; it's a possible skid control ECU malfunction)
     
  15. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Sooo, what are you thinking I should consider changing?

    Also, not sure.if you checked out the pdf files or not, but I noticed yaw rate sensor was reading -128deg/sec (the car was in park, DEFINITELY not yawing at that rate).

    So, thoughts on which relays to check? And how to check them?
     
  16. ChapmanF

    ChapmanF Senior Member

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    I can't imagine approaching the diagnosis that way. Why assume, for example, that only 'relays' might be worth checking? The only advice I can offer is to start looking in the Repair Manual (more info), finding the diagnosis sections for the codes that you have, and following the testing and workup steps that are laid out there.

    Edit: ok, I guess you got 'relays' from the later C1311/C1313/C1253 codes. Yes, those involve relays. Still, it's those sections in the Repair Manual that will show you how to go about testing.
     
  17. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Thank you! I'll check out that repair manual!
     
  18. Brett Kowalczyk

    Brett Kowalczyk New Member

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    Borrowed an oscilloscope from work, checked all the way up to the skid control ecu. Quite nice sine wave when the wheel is spun! So based on the repair manual, it looks like the last thing is the skid control ecu being bad.

    Anything I should know about replacing that? I'm thinking I'm going to have to re-initialize some stuff or something based on what I've skimmed here and there?
     
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