Toyota Prius 2008 won't start after failed to erase lose smart key

Discussion in 'Gen 2 Prius Technical Discussion' started by Norin, Nov 23, 2022.

  1. Norin

    Norin New Member

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    Hello everyone, I have bought a Toyota Prius 2008 with around 177K miles recently. The car come with only a single key so I have tried removing the lose key from the car using Techstream. First, I did insert the key into the slot and then tried to erase other lose key. Unfortunately, it got an error while trying to clear those key. Then, I have retry to clear it again but still got the same error. So, I have tried to take out the key but it seem like the key is locked and can't pull out. I have tried to stop the car with the Start/Stop button but it doesn't seem to shut the car down. So, what I have tried is press Start/Stop button for a few second and the car is shut down.

    Now, when I tried to start the car, it show many warning light on the dashboard. No more "Ready" status on the dashboard. The gear is no longer shift and will flash all the gear on the dashboard when I tried to shift to any gear. And of course the car won't move as well.

    So, anyone has any experience for this issue and know how to fix it?
     
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    You've depleted the 12v battery, check the voltage at the jump points under the hood, then charge at under 4A, or replace (how old is it?).

    FYI : you're moderated until you've posted 5 times.
     
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  3. Norin

    Norin New Member

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    Is jump point refers to the one that is inside the fuse boxes? I used to see it on YouTube but not sure if it's the one.

    > how old is it?
    I am not sure about it since it's a second car and the previous owner doesn't have those information and it's pretty common here in my country.
     
  4. SFO

    SFO Senior Member

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    Post your measured voltage, by using the positive jump point under the hood as shown, and any ground point that can be reached.

    [​IMG]
    Then use a low amperage charger (<4A), try charging it for 8-10 hours, then report back with the measured voltage.
     
  5. Norin

    Norin New Member

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    Thank @SFO for your suggestions. Now the car is starting as normal now.

    This morning, i have tried charging the car as you suggested. When I connect the charger to the jump point, it's shown 9v only. After charging for around 30mn to 40mn, the battery got to around 60% (there is only 20%, 40%, 60%, 80% and 100% in the charger display). But after disconnect charger from the AC, they show only 40% and i am not sure if it's something usual. (I did unplug it since i need to get somewhere this morning).

    Now i have got it to full but not sure how many voltage since I saw the charger showing Full sign and I just unplug it. It should be around 14v from my memory.

    For charging the battery back, do i really need to charge it for 8 to 10h? Because it's quite long tbh.

    Btw, my charger is charging around 5 amperage at the beginning and when it got to full, I saw the amperage is around 4.1A.
     
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  6. dolj

    dolj Senior Member

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    Yes, you do. How long it takes depends on the amperage you use. Toyota recommends 4 A for the Prius. Using 4 A a totally flat battery can take as long as 12 hours, so 8 hours is not that long. A battery will take as long as it takes to charge, so just put it on charge and check it the next day. Leave it on charge until it is fully charged.

    The best state for a lead/acid battery is fully charged, so you do yourself no favors not fully charging a discharged battery.
     
  7. Norin

    Norin New Member

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    Hello @dolj,
    Since my charger is automatically select the Amperage(also voltage) and doesn't allow me changing it to 4A, then should i buy another charger that has the function that allow amperage adjustment?

    From what I know, higher Amperage will make battery hotter than a lower one which will decrease the battery lifespan. And from what i saw, after charging for awhile the battery temperature is around 24 degree Celsius. So, is it worth buying another charger?
     
  8. dolj

    dolj Senior Member

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    No, I would not recommend that. Your current battery charger will manage the current just fine. Besides which, 1 A higher is neither here nor there.
     
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