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GPS Not Working. Home location not accurate

Discussion in 'Prius v Audio and Electronics' started by prevee5, Sep 16, 2022.

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  1. prevee5

    prevee5 Member

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    2012 Prius v Model 5, Non-ATP, 130K miles

    Gps suddenly doesn’t know its location. Home is now 12 miles away. Anyone know of a fix?

    Radio and Satellite / SiriusXM working normally so probably not antenna?

    Don’t use GPS much since we have cellphone GPs but nice to have as a backup.

    Please advise.
    Thanks!
     
    #1 prevee5, Sep 16, 2022
  2. rjparker

    rjparker Tu Humilde Sirviente

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    Gps has a separate antenna
     
    #2 rjparker, Sep 16, 2022
  3. prevee5

    prevee5 Member

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    Has the GPS antenna failed?
    Anyone had this issue?
    Where is the GPS antenna?
     
    #3 prevee5, Sep 22, 2022
  4. rjparker

    rjparker Tu Humilde Sirviente

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    It is under the dash, passenger side if I remember correctly. @gromittoo is the resident expert on the mfd.
     
    #4 rjparker, Sep 22, 2022
  5. Air_Boss

    Air_Boss Senior Member

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    If displayed GPS location changes as you drive, but is wrong, it is the system logic or the satellite ephemeris reads/captures that are erroneous.
     
    #5 Air_Boss, Sep 24, 2022
    Last edited: Sep 24, 2022
  6. prevee5

    prevee5 Member

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    Yes, gps updates while driving and instructs you to turn on streets that don’t exist in the area I’m driving.
    Any fix for this or is the GPS circuit in the head unit “dead”?
    Would a system reset do anything?
     
    #6 prevee5, Sep 25, 2022
  7. rjparker

    rjparker Tu Humilde Sirviente

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    If the gps antenna is weak it may not be capturing multiple satellites which degrades its accuracy.
    @gromittoo ?
     
    #7 rjparker, Sep 25, 2022
  8. Air_Boss

    Air_Boss Senior Member

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    If there are streets the nav system doesn’t know about, it means they are newer than the nav database. Nothing the GPS can do to map streets it doesn’t know exist.
     
    #8 Air_Boss, Sep 25, 2022
  9. prevee5

    prevee5 Member

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    Just to clarify, GPS thinks Home is about 20 miles away from where my actual Home is. No matter where I am, gps mostly routes me to n entered destination starting at my “Home”. Tells me to turn here and there on actual streets but they are nowhere near where I currently am. Seems to call out commands at random. Pretty weird
     
    #9 prevee5, Sep 25, 2022
  10. Air_Boss

    Air_Boss Senior Member

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    Then it is a system logic or satellite ephemeris issue.
     
    #10 Air_Boss, Sep 26, 2022
  11. prevee5

    prevee5 Member

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    Any suggestions on a fix?
     
    #11 prevee5, Sep 26, 2022
  12. Air_Boss

    Air_Boss Senior Member

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    Knowing nothing of the specifics, can you unpower and reset the system, force it to rebuild the ephemeris file?
     
    #12 Air_Boss, Sep 27, 2022
  13. jzchen

    jzchen Newbie!

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    Is there a calibration setting/button like in the ATP NAV? (Vaguely remember there's one hardly ever drive our v).

    REVVL V+ 5G ?
     
    #13 jzchen, Sep 27, 2022
  14. Air_Boss

    Air_Boss Senior Member

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    I have no idea. No issues with our 2012 v Five GPS nav, though it will not lock onto Sirius XM satellites.
     
    #14 Air_Boss, Sep 27, 2022
  15. jzchen

    jzchen Newbie!

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    GPS antenna is usually near/in front of the radio underneath the dashboard. See this manual pg 26 (Moderators this is a link to a Toyota Owners website manual if you need to please approve) also pg 46:

    https://assets.sia.toyota.com/publications/en/omnav-s/OM33A02U-00/pdf/OM33A02U-00.pdf

    "Location & GPS Information" button, see that it acquires at least 3 satellites, (for triangulation).

    On pg 64 there is a "Settings" tab on the top but the manual doesn't appear to explain it. Please check there for possible calibration...
     
    #15 jzchen, Sep 27, 2022
  16. jzchen

    jzchen Newbie!

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    #16 jzchen, Sep 27, 2022
    Air_Boss likes this.
  17. Air_Boss

    Air_Boss Senior Member

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    Not on the non-ATP, but this looks very interesting.
     
    #17 Air_Boss, Sep 27, 2022
  18. prevee5

    prevee5 Member

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    So I pulled 2 fuses associated with the nav system according to the owners manual. Unfortunately, no effect. Any other suggestions?
     
    #18 prevee5, Oct 9, 2022
  19. jzchen

    jzchen Newbie!

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    So did you check if the unit is getting satellite signal/lock???

    REVVL V+ 5G ?
     
    #19 jzchen, Oct 11, 2022
  20. jzchen

    jzchen Newbie!

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    #20 jzchen, Oct 11, 2022
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