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Pre-collision malfunction, headlight malfunction, LDA malfunction all after replacing driver side mi

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by DJW82, May 22, 2024.

  1. DJW82

    DJW82 New Member

    Joined:
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    Location:
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    Vehicle:
    2012 Prius c
    Model:
    Base
    I have a 2018 prius c base. A homeless guy fell near my car and decided to take it out on my mirror. Only the rear housing was damaged, mirror was still fine. While I was on vacation my father in law (retired mechanic) decided to replace it for me. The new mirror works fine but now I have these malfunction warnings! I took the door panel off and unplugged the new mirror and upon inspection noticed that the wiring harness has 5 wires while the old one had six. I tried pluging the old mirror back in, didn't clear thr problem. I tried disconnecting the 12v, did not clear the problem. I'm at a loss here. Is there anyway to clear these malfunctions? Could the new mirror have damaged something by not having a component the computer was expecting to see?
     
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    May 12, 2018
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    Location:
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    Vehicle:
    2018 Prius c
    Model:
    Two
    Sounds like he replaced the mirror with a version that was meant for a car with a different safety/sensor package.

    Replace it with the correct item and the errors are likely to clear on their own- very little chance there's been permanent damage by the use of the wrong part.

    Edit: adding: there is also the possibility of a coincidental, otherwise undetected problem with the car. As always, scanning the car with a hybrid-compatible scanner is always the best way to troubleshoot the more sophisticated features in these cars.

    Good luck!
     
    #2 Leadfoot J. McCoalroller, May 22, 2024
    Last edited: May 22, 2024
  3. DJW82

    DJW82 New Member

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    Location:
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    Vehicle:
    2012 Prius c
    Model:
    Base
    Ok so I replaced with the old mirror and drove about 30km, errors are still there. I don't really believe in coincidences of that magnitude. Everything was working fine before he changed the mirror. Does anyone know a way I can try to clear these errors or am I going to have to go to the dealer? I really hope I don't need to go to the dealer, always costs too much $$$.
     
  4. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

    Joined:
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    Location:
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    Vehicle:
    2018 Prius c
    Model:
    Two
    You may still need to take positive actions to clear the error.

    You could try another 12v blackout- from your first post it wasn't clear if this was done when the original mirror was on the car, or when the replacement was on the car. If the disconnect was done with the new mirror on the car, the computers probably determined it was still in an incorrect configuration as soon as you reconnected the power.

    A 12v blackout done while the original mirror is on the car is likely to clear the error, and (theoretically) because the original part matches the computer's expectations it won't repeat the error status.

    The next-least-expensive step would be to use your own diagnostic device to connect to the car to read (and hopefully just reset) the codes shown. I recently got an Autel AP2500E for under $70 that works with my smartphone and let me clear a similar situation in our own Prius c. (There are even cheaper ones, but I can't offer direct recommendations)

    Next-least-expensive step would be an independent local garage.

    After that? Dealer.
     
  5. DJW82

    DJW82 New Member

    Joined:
    May 22, 2024
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    Location:
    Canada
    Vehicle:
    2012 Prius c
    Model:
    Base
    Nope, 12v blackout not reseting anything. I think I will try the scanner next, $70 is a lot cheaper than even looking at the dealer. I will update when I've tried it