Have Toyota Questions? Ask a Mechanic for Answers ASAP
Thanks for posting
Since it starts and runs with the jumper battery it seems the battery you put in is not fully charged, do you have a battery charger? If so please charge the 12 volt battery at about 10 amps for 5 hours and check again,. The Prius batteries charge very slowly so it takes quite a while because the is no alternator like in non hynbrid cars. It would also help if you have a voltmeter to check the battery voltage, it must be at least 11.5 volts for the computer to let the car run.
Even with a jumper battery it won't start? Do the lights on the dash turn on and do you get a "READY" light?
Somehow it's losing voltage from the 12 volt battery to the front fuse box, do you have a volt meter? Check to make sure the ground wire on the battery is connected to the body.
At this time I don't know if there are any codes, you'll need to check but if no lights on the dash turn on with the power button it won't show any codes, we need to find out why there is no power to the dash, I would like to verify that the system has enough voltage to even power up, can you get a voltmeter and I will instruct you what to do, otherwise I can't help anymore and you will have to have it towed to a dealer.
Ok, let me know if you need anything else or have other questions,.
You're very welcome.
Next open the fuse box under the hood and then open the red cap with a plus sign on it, measure voltage there, let me know what you get.
There is the problem, 11.8 is the absolute minimum or the hybrid system will not start the engine, you'll need to charge the battery up for about 5 to 6 hours at a low current of about 10 amps. Or you can take the battery where you bought it and see what they will do, these batteries are not the same as regular car batteries as I said earlier.
Check the ground connection on the 12 volt battery make sure the ground cable is attached to the inside of the fender.