2007 Prius Touring MFD Calendar date

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by xw20_driver, Feb 24, 2025.

  1. xw20_driver

    xw20_driver New Member

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    Hi all. I'm new here and a new owner of a 2nd gen Prius. It's a 2007 Prius Touring w/ NAV. This car is my first hybrid. My Prius has a calendar and maintenance log built into the MDF. One thing that is bugging me is can the correct date be set for this calendar? The NAV GPS works as far as mapping (outdated maps) and tracking location. But can the date be changed? I viewed the calendar and it only goes up to year 2022? I believe. I haven't found much info anywhere about this online. Did this calendar sync to the current date via GPS? Is there a way or hack to manually set the date to a different year that matches 2025 (for example 2014)?

    If the calendar date cannot be set to the correct date at all, is the maintenance log essentially useless?
     
    #1 xw20_driver, Feb 24, 2025
  2. ChapmanF

    ChapmanF Senior Member

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    GPS transmits a "week number" using just ten bits, so it can only get to week 1023 and then rolls around to week zero again.

    The last time it rolled over was in April 2019. But not every GPS receiver's calendar had to go wrong on that exact date, because the receiver can be programmed to know what the date was when it was built, so it doesn't go funky exactly when the GPS week rolls around to zero, instead it goes funky when the GPS week rolls around to the same week number it was built. So a receiver might be able to show the right date for around 19.6 years from the date it was built (or, anyway, from the base date burned into its firmware). After that, without a firmware update, it'll be funky.

    I don't think we get any firmware updates for gen 2 nav units for post-2022 dates.... :(
     
    #2 ChapmanF, Feb 24, 2025
    Last edited: Feb 24, 2025
    xw20_driver likes this.
  3. Tombukt2

    Tombukt2 Senior Member

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    The car is very entertaining The last thing you'll need to worry with is a maintenance log by yourself a proper scanner that can see freeze frame data do some brake bleeding in a few other sensors and you'll be able to look into and read the car as much as you'll ever want to they're also very forgiving so missing oil change dates and so on and so forth almost mean nothing to these vehicles unless you're just a type that pushes until .....
     
    #3 Tombukt2, Feb 24, 2025
  4. xw20_driver

    xw20_driver New Member

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    It is a very entertaining car indeed. So much advance technology and engineering went into the development of the 2nd gen Prius. It truly is a marvel for it's time. Yet it's so funny how something as simple as the computing the calendar utilizes the GPS week clock instead of allowing it to be set manually.
     
    #4 xw20_driver, Feb 24, 2025
  5. xw20_driver

    xw20_driver New Member

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    Thanks for the detailed technical explanation. I had guessed the date was somehow linked to the GPS but I never knew about the 10 bit GPS rollover dilemma.
     
    #5 xw20_driver, Feb 24, 2025
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