Two error codes-- C1249 and B2284

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Zillennial, Mar 13, 2022.

  1. Zillennial

    Zillennial New Member

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    Hi guys!

    I just got Toyota Techstream working on my 2006 Prius with 117k miles, and after clearing codes and coming back, there are 2 codes I'm concerned about and can't find a lot of details on what they mean for my car.

    C1249 - Open Circuit in Stop Light Switch Circuit
    B2284 - Brake Signal (Cable-Information does not match to BEAN-Information)

    From my research, I can't seem to find anything concrete on what these errors are caused by. I've attached a picture of what randomly happens in my car (warning lights will illuminate, if I turn the car off, they go away and then will randomly pop up again eventually). Nothing changes with how the car drives. I can't tell any difference with it. I talked to one mechanic who mentioned that it was likely caused by the blue ribbons in the combo meter, and when I recently replaced the combination meter in December, I took pictures of the noticeable damage to them.

    Any ideas on these codes? What to troubleshoot or check for? Do you think it's related to these warning lights? Would appreciate anything you have to guess!

    [​IMG]
    EDIT: and I can add that this photo of the error lights is of the first or second time it happened, hence the mileage difference. I've got 117k now.
    [​IMG]
     
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    Have you checked to see if your brake lights work when you press the brake pedal?

    There's a switch mounted at the brake pedal that can fail.
    There's bulbs in the rear lights that can go bad.

    C1249 trouble area:
    Stop lamp switch (mounted at brake pedal)
    Stop lamp switch circuit
    Stop lamp bulb

    B2284 trouble area:
    Power source control ecu
    Stop lamp switch (mounted at brake pedal)
    wire harness
     
    #2 TMR-JWAP, Mar 13, 2022
    Last edited: Mar 13, 2022
  3. Zillennial

    Zillennial New Member

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    Hmm, I just had a friend come and look while I drove around the lot and they said all 3 of my brake lights were functioning. It was not while all those warning lights were illuminated, but regardless, they seem to be functioning just fine.
     
  4. bisco

    bisco cookie crumbler

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    perhaps it is intermittant, or you don't always step on the brake hard enough. it is adjustable. the service manual should have specs
     
  5. Zillennial

    Zillennial New Member

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    Hmm, I really don't think it's the brake light bulbs directly being out. While driving the other day and stopped, with the warning lights on, I could see the red reflection of them in the car behind me. I'm sure it's still *possible* that one of them could be intermittent, but I think there's a good chance it's something else.

    Service manual as in my car's handbook, or do I find that somewhere else?
     
  6. ChapmanF

    ChapmanF Senior Member

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  7. jerrymildred

    jerrymildred Senior Member

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    It would be unusual for the brake light bulbs to come & go, but a loose wire is always possible.

    Is that damage still there? I don't know how it would cause your codes (I'm far from a code expert.) But either way, something went wrong to cause those apparent burn marks on the ribbon cable.

    Hope you can get it sorted out. But, if you can't, Tampa Hybrids is here in Tampa and those guys are good and way more affordable than Toyota. (Transparency alert! I work for them part time, but I work there because I respect their work, not the other way around. ;))
     
  8. Zillennial

    Zillennial New Member

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    Yeah, unfortunately the damage is still there. When I opened it up for the combo meter, I wasn't prepared to repair the ribbon as well (no parts or tutorial for that) and I honestly couldn't find anything about how to do it, after the fact. Funnily enough, I was just at Tampa Hybrids in February for my stolen cat and installing my MillerCat shield. I am trying to avoid going back already, lol.
     
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  9. Zillennial

    Zillennial New Member

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    I found this website link that explains that C1249 is related to the catalytic converter oxygen sensor: C1249 Engine Code Meaning - C1249 Engine Trouble Code - How To Fix C1249 | EngineCodes.net which gives me hope. My cat was recently stolen (as mentioned above) and I had it replaced with an aftermarket and shield, so that makes me think that maybe this is just a normal code that I can ignore? It comes back even when I clear it, so it is a persistent code and not related to just turning the car on w/o a cat (I had a few codes like that that I cleared and did stay gone).

    I also found this link: https://www.tochr.net/2470/brake_signal_malfunction_b2284_.html which gets into a little more of the schematics and shows that it's probably a little too complicated for my blood, haha. I'll probably have to call around to see if I can get any actual quotes.
     
  10. ChapmanF

    ChapmanF Senior Member

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    Not in a Prius it ain't. That's the danger of doing generic web searches for trouble codes.

    If anybody is going to learn two or three things about OBD-II trouble codes, one of those things should be which code ranges are standardized and which ones are manufacturer-defined.

    [​IMG]

    Because C1249 is a C1 code, it is manufacturer-defined, and can mean totally unrelated things in different makes or models of car. Searching it up on the web is just a recipe for getting wrong answers.

    If you were looking up some C0 code, you could search on the web and it wouldn't be as crazy, because codes in the C0 range are standardized by SAE, and your search results would at least be close to what the code means in a Prius.

    You are still best off looking in the repair manual (more info). Even for standard codes, the repair manual is where you will find the most useful Prius-specific info on dealing with it. And for a manufacturer-specific code, looking in the repair manual is how you know you're not getting information about some totally different car.

    In a Gen 2 Prius, C1249 ("open in stop light switch circuit") means that the skid ECU noticed the stop light switch circuit open for at least ten seconds while the car was on (IG1 terminal voltage above 9.5).

    There are five pages in the manual for troubleshooting and solving the issue.
     
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  11. Zillennial

    Zillennial New Member

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    Oh yes thank you for that clarification! You're totally right, I did see about the manufacturer-specific codes and then got distracted on that line of research. Trying to do too many things at once, oops. Thank you so much for that graphic too, super helpful for the future reference.

    I did get the repair manual open as well through my public library which is an awesome resource, and pulled up those pages (I believe) that you mention. Since the brake lights are functioning fine, I see that the next step is to measure the voltage of the connector. I don't personally have access to that, but I know someone who might have a multimeter. Definitely nervous about this being an ECU issue, after reading some threads about that. How urgent is this issue? Is this something you think if left unattended is going to worsen or damage the car?
     
  12. ChapmanF

    ChapmanF Senior Member

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    Well, in step 5 you're either going to find out there's a wiring issue that you can probably fix for little to no cost, or an issue you can fix by swapping the ECU, which you can probably obtain used for $50 or less. This is not like a Gen 3 where the ECU is built into some other expensive assembly. Yours is just sitting there under the dash.

    In my experience, for maintaining a car, the most important thing psychologically is to keep on top of things. As soon as you've decided you're going to ignore one issue you know about, you've begun the vicious cycle that will end in ditching the car.

    If you check in the wiring diagram (should be available at the library same way as the repair manual), you can see that circuit is not just an input to the skid ECU, but also to the hybrid vehicle ECU and the power source control ECU. There is a junction connector J9 in the dash where the signal branches off to those places, which I think I would look at with great interest, seeing as (for now, anyway) the skid ECU is complaining about that signal while the other ECUs are not.

    Of course your B2284 is also directly related, as the smart key system says it is getting information from two different sources that disagree whether you are applying the brake.

    As that information not only controls the brake lights in back but also whether you can start the car, it would be possible for the issue to develop into a bigger inconvenience.
     
  13. Zillennial

    Zillennial New Member

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    Oooo, thank you for that note about the Gen3 ECU vs Gen2... I think I was accidentally reading some threads about that fix instead of the Gen2 and getting concerned about the extremely high costs of that potential. I always try my best to DIY with things that I can, but I'm not sure I have the equipment or skills for this. I'll check with my sister to see if she's up for the job, as she does understand wiring diagrams with her field of work lol. Great point about it also having to do with starting the car; I have intermittent issues with my SmartKey not being recognized when I'm in the car (I'll unlock the doors just fine but sometimes when I go to turn the car on, it will think it's not inside the cabin, and I'll press the keyfob to lock the doors, then turn the car on and it works fine), so maybe that is related.

    So much possibility for old wiring to start going wonky! I will say I am a little confused with the page I'm looking at and where exactly I can find directions on actually getting the Skid Control ECU to check it. Where do I go to find the information on actually getting to this point? Is this within the dash, like if I was tearing it apart to replace the combo meter? https://i.imgur.com/8nuELlG.png
     
  14. ChapmanF

    ChapmanF Senior Member

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    I think you can pretty much spot the skid ECU by putting your head where the driver's feet go and looking up. Look for something with the four connectors shown in your picture.

    The wiring diagram has a "location and routing" section, which is where to turn for such things.
     
  15. Zillennial

    Zillennial New Member

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    Hmm... so I had a look under there and couldn't see anything. I saw this ebay listing, and I guess I would not have the same angle perhaps to see this, but does this look like what I'm looking for? 2006 Toyota Prius Skid Control ECU 89540-47100 | eBay

    Do you see it in any of these pictures? The blue-covered wires looked sort of similar, but there are only 2 of them.

    [​IMG]

    [​IMG]

    [​IMG]
     
  16. ChapmanF

    ChapmanF Senior Member

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    Yes, that's it in your third pic, the aluminum box with the heat-sinky fins.

    Here's another pic with its four electrical connectors all unplugged.

    [​IMG]
     
  17. Zillennial

    Zillennial New Member

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    Haven’t had a chance to try any troubleshooting yet (I’ll see my sister next week and hopefully can have her help to borrow the multimeter) but weirdly enough since my oil change and tire rotation, brake error lights haven’t come on once. I’m assuming it’s just coincidence.

    Also had a friend who followed me for a while driving home yesterday and said my brake lights didn’t come on the WHOLE TIME (30min or so). I had already shut the car off by that point, turned it back on, drove around the parking lot and they worked just fine. So maybe it is an intermittent issue. Sigh.
     
  18. Zillennial

    Zillennial New Member

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    Final update: took it to a Toyota mechanic (not dealership) and they replaced the stop light switch, came out to about $200 post-tax. Fixed this issue, as well as the issue I was having sometimes where even though my foot was on the brake, the car would not fully turn on and display READY. Didn't have the energy to do it myself, unfortunately, but wanted to give this conclusion for anyone in the future researching these sorts of issues.
     
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