No start

welcome!

1) the battery in the hatch corner is the 12v battery.

2) the hybrid battery is beneath the spare tire

3) the gauge on the dash is for the hybrid battery

4) jumping the 12v battery has no effect on the hybrid battery

start fresh: make sure you have a healthy 12 volt. forget jumping, charge or replace it if it won't pass a load test.

did you replace the orange safety connector properly, following a youtube video and completing all 3 steps?

 

Is the orange plug for the hybrid battery seated properly?

 

concentrate on this one very simple task.

Open the hood and in there on the right is the black plastic fuse box.
Take the black plastic cover off. In there is a little red cover. Flip it up to the side. Under that red cover is the 12 volt front jump point bolt.
That bolt under there is connected directly to the positive 12 volt battery post. Measure there with a dc voltmeter one probe on that bolt the other one a chassis ground we use the nut right above it on the chassis.

Whats the 12 volt battery read there? Unless you can do this correctly the car has no chance of ever starting.

Then we will move to the main problem which is the fuse that's basically a wire under the clear plastic view panel right below that jump point in that box. Thats usually blown open on a reverse jump.

Btw, the reason the guy jumped it wrong was because he did not use the front jump point Toyota provided the one i am pointing you too.
He jumped it directly to the battery in the hatch wrong. Easy to get turned around in that dark hole. Usually a guaranteed fail.

 

Please let us know which region in US you are in if you want to generate interest in your post from people who live near you and may be able to assist with parts and diagnostics.

 

@mark earl

... remove each fuse starting on the left side and, using an ohmmeter, check that all fuses have continuity.

More than one fuse usually blows in addition to the large 100A multisectional fuse referred to by EdtheFox. Also, check the 5A fuse in the block on the 12V terminal connected to the 12V battery in the back. In this image below the 12V sense-wire is indicated and right next to that plug is the 5A fuse.


If you're lucky you will find blown fuses and once replace with good quality new ones, your car will start.