1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Pre-collision system malfunction

Discussion in 'Gen 4 Prius Main Forum' started by shadow4478, Nov 16, 2022.

  1. shadow4478

    shadow4478 Member

    Joined:
    Aug 14, 2017
    84
    53
    0
    Location:
    Barrie
    Vehicle:
    2017 Prius
    Model:
    N/A
    2017 Prius
    134,000 km
    Today out of nowhere message displayed “pre-collision system malfunction visit your dealer”
    Cruise controller raider works Lene assist works any information on this?
     
    #1 shadow4478, Nov 16, 2022
  2. shadow4478

    shadow4478 Member

    Joined:
    Aug 14, 2017
    84
    53
    0
    Location:
    Barrie
    Vehicle:
    2017 Prius
    Model:
    N/A
    The windshield was changed about two months ago. They did say it may need to be recalibrated, not sure if that has to do with anything as the lane sway assist works
     
    #2 shadow4478, Nov 16, 2022
  3. jdenenberg

    jdenenberg EE Professor

    Joined:
    Nov 21, 2005
    3,873
    1,871
    1
    Location:
    Trumbull, CT
    Vehicle:
    2020 Prius
    Model:
    LE AWD-e
    Shadow,

    The radar is behind the Toyota front emblem. If it gets dirty, the safety systems can shut down. Take a wet rag and clean it. Hopefully that will correct the issue.

    JeffD
     
    #3 jdenenberg, Nov 16, 2022
  4. shadow4478

    shadow4478 Member

    Joined:
    Aug 14, 2017
    84
    53
    0
    Location:
    Barrie
    Vehicle:
    2017 Prius
    Model:
    N/A
    No, it’s clean washed off same thing
     
    #4 shadow4478, Nov 16, 2022
  5. Elektroingenieur

    Elektroingenieur Senior Member

    Joined:
    Jan 8, 2017
    2,515
    3,268
    9
    Location:
    California
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    To find out why the message appeared, you (or a dealer or independent shop) need to retrieve the diagnostic trouble codes (DTCs) stored in the driving support ECU assembly, and then review the related information in the Repair Manual (more info).

    This requires a Toyota Techstream diagnostic system or true equivalent; inexpensive OBD II code readers made for engine and emissions diagnosis aren’t programmed to communicate with the driving support ECU.
     
    #5 Elektroingenieur, Nov 16, 2022
  6. AzWxGuy

    AzWxGuy Weather Guy

    Joined:
    May 22, 2011
    1,003
    498
    0
    Location:
    Tucson, AZ
    Vehicle:
    2021 Prius
    Model:
    Limited
    A camera recalibration is definitely required after windshield replacement. Otherwise, have you disconnected your 12V battery lately? There is an ECU requiring a reinitialization procedure. The non-operational fault is mentioned in the user manual on page 301, and the initialization procedure is on page 383. These procedures may be on different pages in your manual. My manual is Toyota 2021 Prius Owner's Manual (OM47E09U).
     
    #6 AzWxGuy, Nov 16, 2022
  7. MikeV

    MikeV Junior Member

    Joined:
    Nov 22, 2020
    95
    20
    0
    Location:
    philadelphia
    Vehicle:
    2010 Prius
    Model:
    Three
    Did you ever figure this out?

    Having exact problem as yours
     
    #7 MikeV, Aug 30, 2023
  8. shadow4478

    shadow4478 Member

    Joined:
    Aug 14, 2017
    84
    53
    0
    Location:
    Barrie
    Vehicle:
    2017 Prius
    Model:
    N/A
    For me it was the camera, they nicked a clip while replacing the windshield, they tried to tape it with double sided tap but didn’t work, then they ordered a new clip and it worked without issues.
     
    #8 shadow4478, Aug 30, 2023
  9. MikeV

    MikeV Junior Member

    Joined:
    Nov 22, 2020
    95
    20
    0
    Location:
    philadelphia
    Vehicle:
    2010 Prius
    Model:
    Three
    was it covered under warrant and why did the lda LDA still work
     
    #9 MikeV, Aug 30, 2023
(You must log in or sign up to post here.)