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My wife was driving our 2008 Prius this afternoon and while at a long stop the car died. Display went black, never to come back on or show signs of life. We tried jumping it, nothing. Two different towing companies came out and plugged in portable jump starters, nothing. We tried the other key in case there was a signal issue with the key, no change. I checked the fuse in the car for the start system / display, it looked fine. Tried another fuse anyways, no change. Power locks work, interior lights work, brake lights and flashers work. From what I've read, the 12v battery causes a lot of problems but a jump start or portable charger should be able to get the car operating again. I'm going to start on it tomorrow morning and check the charge on the 12v battery, any other ideas besides that?
 

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I can't recall the exact number of amps needed to jump a Prius from the jumping post under the hood, but it is quite minimal, and much lower than a regular ICE vehicle. The 12v battery in the Prius is not very large as it doesn't have to turn a motor over. The vehicle only needs enough amps to boot the computer, go through initial self test, and close the relay to the traction battery. Once the traction battery is connected and the vehicle is on, the 12v sub-system of the vehicle is run off the traction battery. A jump start box should be able to do it, and I've started a Prius off the jump post under the hood using a conventional jump start battery box. The vehicle shouldn't just turn off at a stop. I suspect a problem that is deeper down than just an old 12v aux battery.
 
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