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2007 Prius Gen 2 - FOB stopped unlocking doors.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by appelton, Feb 22, 2024.

  1. appelton

    appelton Junior Member

    Joined:
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    2007 Prius
    Model:
    Base
    So this thing just happened, where on a few occasions I couldn't open the doors with the fob by pressing the button. I thought that the battery on the fob is probably dead.
    I changed the battery, and after placing the battery I can see RED light on the fob blinking for about 20 seconds then it goes off.

    Replacing battery on the fob did not help, as fob still doesn't open the door. I have to use manual key to open the doors, car drives and works like nothing happened.

    What should I do ?
     
    #1 appelton, Feb 22, 2024
  2. appelton

    appelton Junior Member

    Joined:
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    2007 Prius
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    Base
    I just went to check the 12v battery to the service and turned out it was all covered in foam looking dead pretty much. We replaced it to a brand new one. I also got my middle dash replaced, which died sometime ago. All in all the fob started to work . It locked and unlocked the door. So obviously it was 12V battery right? ... WELL NOPE ....ZONK...I just came back tried to use the fob again and guess what. Can't lock / unlock doors again. Damn ...
    Any ideas what could it be ? Immobilizer ? or something ? I 've noticed the red light on the remote keeps blinking when I am next to the door.
     
    #2 appelton, Feb 22, 2024
  3. bisco

    bisco cookie crumbler

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    Plug-in Base
    I’d test both batteries to start with
     
    #3 bisco, Feb 22, 2024
  4. appelton

    appelton Junior Member

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    2007 Prius
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    Base
    Something super weird is going on ...the lock/unlock is back again working, meanwhile the middle console screen that they replaced and was working, all of a sudden touch display stopped working.
     
    #4 appelton, Feb 22, 2024
  5. dolj

    dolj Senior Member

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    My guess would be one of the buttons on the fob circuit board is sticking in the "ON" position.
     
    #5 dolj, Feb 22, 2024
  6. appelton

    appelton Junior Member

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    Location:
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    Vehicle:
    2007 Prius
    Model:
    Base
    I tried to wipe everything as much as I could. Would duplicating a key work ?
     
    #6 appelton, Feb 26, 2024
  7. dolj

    dolj Senior Member

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    You would need to open up the fob (not easy as it is glued together) and spray the three switches on the PCB with electrical contact cleaner to even have a chance at cleaning the physical switches.
    Only it you have a fully working fob to start with.
     
    #7 dolj, Feb 26, 2024
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