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Precollision unavailable

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by mike091020, Jan 4, 2017.

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  1. mike091020

    mike091020 Junior Member

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    I have just under 15K miles on my 2016. My wife got a message about the precollision system. When I got to see the car there was a flashing display light showing two cars crashing and the notation "off". I looked stuff up in the manual and was directed to the settings and found that crashed car icon with the ability to turn precollision on/off. When I tried to turn it ON, it gave me a warning message: "Precollision Unavailable".

    Of course, I am taking it in for service to see what's up but I thought I might as well get whatever information I can from the gurus here.

    Any thoughts? (Oh, and just three days ago I had it in for the 15K miles service so I suppose they could have broken the car when they did that.)
     
    #1 mike091020, Jan 4, 2017
  2. wrprice

    wrprice Active Member

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    Give the front Toyota logo a gentle cleaning. I'll assume you haven't modified or covered it with anything.

    Does DRCC work and report "RADAR READY" or does it report a malfunction, too?
     
    #2 wrprice, Jan 4, 2017
  3. RCO

    RCO Senior Member

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    I may be preaching to the choir here, so forgive me if you already know how.
    To turn on DRCC you have to press the button on the end of the stalk and a message come up on the top screen. Once you have reached the required speed drops the stalk down to activate DRCC, the screen gives another message and an image of a grey car between converging lines. There's also a yellow indicator to the right of the dash.

    This is definitely a poser, so please keep us informed as to progress. We all hope it's something really resolve, if only by the dealer.
     
    #3 RCO, Jan 4, 2017
  4. mike091020

    mike091020 Junior Member

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    Thanks for the suggestions. I'll not be able to get to it until Friday, and then I have an early morning appointment with the dealer. As to cleaning it, that sounds promising, except that it has been raining and I would think that the rain would clean it a bit. I took the car in for service about three days or so before the problem popped up and I had the car washed at that time. If the dirt from two days freeway driving can disable the system, I think we have a real problem.

    However, a new symptom: it is now intermittent. (Arrrrg, I can hear the dealer now "Bring it back when it does not work!" I hate it when they try that. But so far my dealer, Jim Coleman in Bethesda, MD has been excellent.) My wife said it was off for two days (she kept the message on the display all that time) and about two miles from home yesterday, it started working again. This is aggravating. I consider this a serious safety issue as it is part of an automatic system that intercedes in the driver controlling the car. All I need is for the car to feel it has to take over for some reason. Not acceptable. I'll let you know what the dealer says, but I don't hold out much hope.

    Oh, and the manual talks about temperature extremes causing problems. The temperatures here have been well within the normal range. Lows in the high 30's and highs in the low 50's.
     
    #4 mike091020, Jan 5, 2017
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  5. ETP

    ETP 2021 Prime(Limit),Highlander HYB Plat,B52-D,G,F,H

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    Must be related to the loose nuts issue.:ROFLMAO:

    Most likely the lowest bidder for sub part assemblies.
     
    #5 ETP, Jan 6, 2017
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  6. Prodigyplace

    Prodigyplace Senior Member

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    Let's hope some loose nuts do not run in front of the car until it gets repaired. :D
     
    #6 Prodigyplace, Jan 6, 2017
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  7. mdmikemd

    mdmikemd Member

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    So I had a big cardboard box I was about to throw out. Decided to test my daughter's precollision system in her Prius. Only got to about 20mph and than BAM!, I hit the box. Is there a minimum speed that it activates?
     
    #7 mdmikemd, Feb 20, 2017
  8. jdenenberg

    jdenenberg EE Professor

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    The precollision system in our Prii is radar-based. Cardboard is invisible to the radar.

    My Wife's Subaru Crosstrek uses 3-D vision and would "see" a cardboard box.

    JeffD
     
    #8 jdenenberg, Feb 20, 2017
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  9. mdmikemd

    mdmikemd Member

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    Well then, it is time to make the next generation fighters out of cardboard!
     
    #9 mdmikemd, Feb 20, 2017
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  10. ETP

    ETP 2021 Prime(Limit),Highlander HYB Plat,B52-D,G,F,H

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    Cardboard aliens don't have a chance.
     
    #10 ETP, Feb 21, 2017
  11. wrprice

    wrprice Active Member

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    Made from 100% post-apocalyptic waste.
     
    #11 wrprice, Feb 21, 2017
  12. kithmo

    kithmo Couch Potato

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    It can see plastic trash bin (y)
     
    #12 kithmo, Feb 21, 2017
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  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Tape on some tinfoil would work?
     
    #13 Mendel Leisk, Feb 21, 2017
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  14. Prodigyplace

    Prodigyplace Senior Member

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    Issue tinfoil hats to all cardboard boxes? :LOL:
     
    #14 Prodigyplace, Feb 21, 2017
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  15. tucatz

    tucatz Active Member

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    Is the pre collision system active even when the DRCC is turned off? And when the LKA is turned off?
     
    #15 tucatz, Apr 15, 2017
  16. Tideland Prius

    Tideland Prius Moderator of the North
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    Yes. It may use the same components as DRCC/LDW but it's an independent system.
     
    #16 Tideland Prius, Apr 15, 2017
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  17. ETP

    ETP 2021 Prime(Limit),Highlander HYB Plat,B52-D,G,F,H

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    That has always confused me to say the least. But good info.
     
    #17 ETP, Apr 16, 2017
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  18. Mendel Leisk

    Mendel Leisk Senior Member

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    Just all these acronyms have me confused. (n)

    Don't anyone try to enlighten me, happy where I am. :ROFLMAO:
     
    #18 Mendel Leisk, Apr 16, 2017
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  19. Tideland Prius

    Tideland Prius Moderator of the North
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    PriusChat Glossary | PriusChat :D
     
    #19 Tideland Prius, Apr 16, 2017
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  20. tucatz

    tucatz Active Member

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    Call the geek squad!

    I wonder if there's a market for Prius tutors here in the Bay Area?
     
    #20 tucatz, Apr 16, 2017
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