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Cold weather dashlights don't work!

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Dow, Nov 21, 2014.

  1. Dow

    Dow New Member

    Joined:
    Nov 16, 2014
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    Location:
    Clatskanie, OR
    Vehicle:
    2007 Prius
    Model:
    II
    My wife's 2007 Prius Dash lights stop working in extreme cold weather. We have asked the dealer 3 times about it but to no avail! No one seems to have any ideas about this. Does any body have any suggestions. I don't even know where to start with this one?
     
    #1 Dow, Nov 21, 2014
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Vehicle:
    2015 Prius
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    Two
    If the combination meter is the only system which is intermittent, the problem is with that device. It had been covered under an extended warranty.
    T-SB-0172-09 Combination Meter - Intermittent Display | PriusChat

    Otherwise, if the combination meter is not the issue, then I know where to start:

    1. Obtain the electrical wiring diagram for your model year at techinfo.toyota.com
    2. Get a decent digital multimeter for use in troubleshooting
    3. Find a system that is intermittent.
    4. Refer to the EWD to determine the relays and fuses that feed that system
    5. Park the car outside in cold weather so that the system will not function
    6. Use the multimeter set to voltage and trace the wiring (per the EWD) to see where you no longer measure 12V. That is where your problem is.

    Most likely, the problem is a relay that gets stuck so it will not engage in cold weather.
     
    #2 Patrick Wong, Nov 21, 2014
  3. Dow

    Dow New Member

    Joined:
    Nov 16, 2014
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    Location:
    Clatskanie, OR
    Vehicle:
    2007 Prius
    Model:
    II
    I thank you Mr. Wong! It is sure nice to have a place to ask questions and get good advice.
     
    #3 Dow, Nov 21, 2014
  4. Mrs.Diamond

    Mrs.Diamond Junior Member

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    Three
    Did you find the fix? I’ve been having the same issue.
     
    #4 Mrs.Diamond, May 12, 2018
  5. dolj

    dolj Senior Member

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    Vehicle:
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    Search for Combination Meter in the Gen 2 forums.

    Essentially, if it is faulty, send yours to Matt @Texas Hybrid Batteries with some $$$, your ODO reading and he will send you a refurbished unit with the correct milage programmed. Contact him direct for details.
     
    #5 dolj, May 12, 2018
    Mrs.Diamond and Raytheeagle like this.
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