Join Date: Jun 2010
Location: Pac NW
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Yes, you are in the right place.Sorry to hear about your vehicle trouble.
1. is there any warning lights in the dash?
2. do you have nav unit? Navigation? If yes, do this. Sit inside the car, turn system to Aux position (either by key or pressing Start button twice without touching the brake pedal0, press and hold Info button on the nav unit and start flipping light stalk all the way to lights On and back ot Off. After about 3-5 flips like this, nav should show diagnostic mode display. In it, you can navigate to 12V battery state of charge. If it's below 12V (11.7 to be precise) it's 12V battery.
3. If you do not have nav unit, 12V has to be tested with deep cycle battery tester.
4. if it's the original Panasonic, it is most likely dead or dying. 13 yo old battery, what to expect.
5. hybrid battery state of charge will have to be either scoped by dealer or hybrid indie or with Bluetooth dongle for OBD2 port and phone app, like Doctor Prius or Toque Pro.