07 Prius - I'm Lost

To start, you need a 12V battery. It turns on all the ECUs for testing and starts the main relays of the high-voltage battery for further starting of the internal combustion engine.
The first thing you need is a good charged 12V battery connected correctly. It is better to disconnect the old and discharged one so that it does not eat up the energy of the new one. Unscrewing the negative terminal between the battery and the car body is enough.
The second thing is that you need a key fob for the car. Without a key, your attempt may not be successful.

 

Is the dashboard still intact in this Prius? If so it's probably reasonably unmolested Is there another Prius that looks the same as the one you're trying to get in the yard Don't even worry about the battery at this point Just is there another Prius on the yard that looks like the one you want maybe that has a key with it not a metal key that sticks in the door but the plastic thing that goes in the slot right above your knee to the right of the steering wheel this is important If there's another car on the lot that has at least one remote if you get the remote put a battery in it Make sure the red light and the upper right hand corner flashes when you're pushing any of the buttons which there are three of. If you were to rip open the corner of the dashboard right ahead of the steering wheel you'll see the black SKS or immobilizer computer a 10 mm bolt and a plug holds it where it is unplug it take that along with that fob from the car you just got it from making sure that the key in the fob turns the lock cylinder in the door of the car you're taking this mess from take that SKS or immobilizer computer to the car you're trying to start along with the fob undo the dash take out the computer that's there and put in the one that you just took out of the car with the fob The fob works the SKS or mobilizer computer is plugged in now get a battery that you can put back in the trunk that has 12.5 to 12.7 volts and that group size in that AGM battery If you can't do that you can rig up another battery back there but realize the battery clamps and cables will not fit the nonsense you're trying to put in the car so now you're going to go out and cut up your mess and get some terminal ends that will fit the battery that won't fit in the space in the car just so you can lay it in the trunk to turn the car on kind of robbing Peter to pay Paul right But anyway that's what you do with the junkyard so now you have 12 volts you've got it connected even if you're using vise grips holding the positive and negative terminals to the oversize battery post on the battery we're trying to jigga in there. Why don't you have all that sorted out and you manage to get power all the noise and nonsense you're hearing under the fuse box maybe take the lid off said fuse box and look at the clear long strip that's your fusible link maybe even have your buddy put the car on so all the noise can start again You probably going to find it's not coming from your fuse box It might be the coolant heat storage tank pump making a racket maybe even the inverter pump they're supposed to be colored fluid in the near opaque semi clear jugs that are called reservoirs You might want to make sure stuff is in those You can just pour some water for now whatever doesn't even have to be really super clean now try booting the car up again does everything start whirring . Then maybe get a little quiet in a couple of seconds You're making headway are you able to now ready the car?

 

Simple question. Are you using the key via wireless or sticking it into the port on the right side of the wheel? OK one more. When you push the start button do you have your foot on the brake pedal? The fact that the brake system is making noises tells me the jumper battery is working. If you didn't try the 2 things above give them a shot. Otherwise I have nothing, the computer systems in these cars is beyond my skill, knowledge and tool inventory.

 

If you are not very DIY, I would pass on this. There's a bunch of Prius specific things on these cars, and several can be quite pricey ($$) to repair if you have to pay someone else to fix.

First is the key fob. Bootleg Techstream can be problematic- have you tried your setup on another Toyota to know that it works? I think you should be able to talk to a few of the 15 systems on a Gen2 even if it won't turn on. Others have mentioned a "pat your head - rub your belly" procedure to wake up some systems, but I haven't seen that in the service info.

If you have the correct type of fob for this car you need a "seed code" from some site in eastern Europe. I usually have this done at the dealer or a capable locksmith. The car will not turn on at all until this is taken care of.

The noise when stepping on the brakes sounds like it could have a bad pump in the brake actuator. Not uncommon failure but the only fix is to replace the entire actuator (and used ones are a 50-50 shot it will work).

HV battery might be ok - or not (assuming it's still there). Any replacement that's not new from Toyota is a so-so chance of working.

This car is a "common" target for catalytic converter theft. The OE unit is pricey.

Engines are generally reliable, but will consume oil as mileage increases - moreso if oil changes were neglected.

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