Instrument Lights - Let's Contact Toyota

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by keymusic, Nov 9, 2016.

  1. keymusic

    keymusic Active Member

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    So it turns out that in the 2017 Prius Two (I assume also the 2016), the instrument cluster brightness does not work as stated on page 98 of the manual. It only works properly on Three and above. This did work properly on the 3rd gen Prius Two. During the day if you turn on the headlights or parking lights, in other words when you turn on the tail lights, the instrument brightness is not supposed to dim. That's the only purpose of the ambient light sensor on the dashboard in this model since it doesn't have auto-headlights.

    I have contacted Toyota and I was just put in a loop between them and a local dealership's service dept. This needs to get to the proper dept in Toyota so that it can be fixed. I'm assuming it's a simple software change, as long as the hardware is there, which it seems like it is. Also, it specifies that this works in the manual and I consider this a safety issue.

    Does anyone know how to contact the right dept in Toyota to start the process of getting this taken care of?
     
    #1 keymusic, Nov 9, 2016
    Last edited: Nov 10, 2016
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  2. bisco

    bisco cookie crumbler

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    start with priusteam, here on priuschat. what is the dealer saying?
     
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  3. mark27lim

    mark27lim Active Member

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    you can try carista to play around with the ambient sensor sensitivity settings and see if that helps?


    iPhone ?
     
  4. keymusic

    keymusic Active Member

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    I showed the dealer in a Two and Three on their lot, they didn't know anything about it.
     
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  5. keymusic

    keymusic Active Member

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    According to the manual the customization settings are -2 to +2 to change the sensitivity, with 0 being the default. However, the not dimming the cluster lights in daylight function with headlights on simply isn't working at all in the Two. Hence changing the sensitivity won't do anything.
     
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  6. bisco

    bisco cookie crumbler

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    have you contacted other two owners for their experience?
     
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  7. keymusic

    keymusic Active Member

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    No that isn't necessary. I confirmed that the behavior of mine is the same as other Twos by checking them at a dealership.
     
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  8. bisco

    bisco cookie crumbler

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    all the best!(y)
     
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  9. Prodigyplace

    Prodigyplace Senior Member

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    My 2017 acts like that.

    And, I am sure, there are more than two of us.

    :D
     
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  10. keymusic

    keymusic Active Member

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    Yep all of the Twos are not behaving properly.
     
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  11. wrprice

    wrprice Active Member

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    Nitpicking, but it should also be used by the auto climate control system. More ambient light should correlate to higher cooling effort, and at night a less aggressive use of the blower fan.
     
  12. Prodigyplace

    Prodigyplace Senior Member

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    It possibly *could* , but I know the Eco mode of the auto climate control does not vary the fan speed, so I doubt it is used for that.
     
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  13. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Sounds like you're on to something, and going through channels, "presenting the case" in a way that should wake them up. Good luck!
     
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  14. bisco

    bisco cookie crumbler

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    if it's a safety issue, nhtsa will force toyota to fix it.
     
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  15. Prodigyplace

    Prodigyplace Senior Member

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    It would be good to get some response to this from @Prius Team
    Or possibly how to officially present the issue.
     
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  16. bisco

    bisco cookie crumbler

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    that's the ticket.;)
     
  17. keymusic

    keymusic Active Member

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    I might not have a case if it didn't specify on page 98 of the manual that it absolutely is supposed to function this way. And it doesn't say "*if equipped" so it needs to function properly on every trim level with standard features.
     
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  18. wrprice

    wrprice Active Member

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    It did on my Gen2, my Gen3 Two, and also my '94 Dodge. None of those cars had auto headlights, FWIW. They all had auto climate control.
     
  19. keymusic

    keymusic Active Member

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    I thought of contacting the NHTSA but I'm not sure if that'll do anything.
     
  20. Prodigyplace

    Prodigyplace Senior Member

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    I think all trim lines have the same climate control. Does yours vary the fan speed?
     
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