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Dash Clock Loosing 1 minute Per Day???

Discussion in 'Gen III 2010+ Prius Audio and Electronics' started by Hank101, Apr 30, 2012.

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  1. Hank101

    Hank101 Member

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    Any ideas as to why this would happen on a new 2012 Prius II?
    Thanks
  2. dustoff003

    dustoff003 Blizzard Brigade #003

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    Interesting mine seems to gain a minute every couple of months.


    Posted from my iPhone via the Tapatalk app.
  3. Tech_Guy

    Tech_Guy Class Clown

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    You're driving so fast that time is running backwards???

    Keith
  4. GrumpyCabbie

    GrumpyCabbie Senior Member

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    lol, it's all that speeding near 88 mph eh? ;)
  5. jdcollins5

    jdcollins5 Senior Member

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    I have to adjust mine a couple of minutes every few months. I have never bothered to remember whether it was forward or backward.

    The next time you are at the dealer show it to them. If some way you can take a dated picture one day and then a second dated picture the next day then you can verify it for them.
  6. Tech_Guy

    Tech_Guy Class Clown

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    Maybe a bit faster than 88 mph, like something closer to the speed of light (~186,282 miles/sec)

    (That is fast enough where the red stop lights appear green as you approach them.)

    Keith :)
  7. prius2010II

    prius2010II Member

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    Which is more likely? A Prius driving at the speed of light or a flux capacitor equipped Prius able to break the time barrier at 88mph?
  8. fuzzy1

    fuzzy1 Senior Member

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    That is a 700 ppm error on the clock crystal. It is defective, as even a very cheap crystal should be within 50 ppm (parts per million).
  9. blane

    blane Carmudgeon

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    At least there is a "00" button to zero out the excess minute when you press it on the top-of-the-hour radio station time signal.
  10. DetPrius

    DetPrius Active Member

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    Mine gains almost a minute a month. I brought this up when it was under warranty and they "checked it" and said it was not off by enough to replace under warranty. This is something I would expect from a clock in a car in the 70's but not in 2010, or 2012. Lowest bidder for parts?
  11. KK6PD

    KK6PD _ . _ . / _ _ . _

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    So at what altitude are you driving? It's a known fact the further you get away from Earths Gravity Well, the passage of time changes, relative to Sea Level on the planet!
  12. Rebound

    Rebound Senior Member

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    I adjust my clocks twice a year, whether they need it or not.
  13. Big Steve

    Big Steve ramblin wreck

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    A chip that can not keep time for a 24 hr period is scary as the timing signal for everything else the electroincs in htis car do.

    Are you sure it is the car and not the time source you are comparing it to?
  14. Eoin

    Eoin Active Member

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    On the bright side, a stopped clock will be accurate twice a day.
  15. KK6PD

    KK6PD _ . _ . / _ _ . _

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    The clock chip that the clock uses is self contained, does not accept any time synchronizing or external reference. The clock chip timing is usually set by a quartz crystal and a capacitor, sometimes adjustable. In this case I would think the crystal is out of tolerance, or the cap is not the right value.
    The only way to fix this, is 1, take the clock apart, see what clock chip they use, look up the data sheet for that chip, figure out what they are using for reference. Repair, replace components as necessary. Or 2..
    Now we all know that NO dealer anywhere is going to go to that extreme to fix the clock. They are just going to pull a new clock unit off the shelf, and replace the defective one. Assuming you find a sympathetic ear, and a Service Manager who thinks losing a minute a day is worth the efforts to swap out the clock! Of course you have to prove the clock is bad, and out of tolerance.
    At this point I will say good luck, you might just have to bite the bullet and live with it, or buy a clock replacement yourself and do your own swap out!
    Let us know how it goes! :D
    1 person likes this.
  16. tach18k

    tach18k Member

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    Havent seen and issue with my clock, seems spot on....
  17. Big Steve

    Big Steve ramblin wreck

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    Understood that the clock is separate, just hope the rest of the electronics are better designed and implemented.
  18. KK6PD

    KK6PD _ . _ . / _ _ . _

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    I would think so, I would imagine the clock is outsourced to a third party supplier!
  19. Big Steve

    Big Steve ramblin wreck

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    Let us pray! ;-)
  20. qbee42

    qbee42 My other car is a boat

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    And is shockingly inexpensive. Even as an electronics designer, I am continually amazed at the low cost of these mass produced items.

    Tom
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