2010 Prius unable to start without key fob on start button

My 2010 Prius was bought used on a salvaged title in June of last year. Ran great at first. About a month in it started having issues with the 12v battery. We had it tested and found it was no longer any good as it was several years old. Had the battery replaced and again things were fine for a few more months. But then we started having the "Check hybrid system" warning pop up. I did some research online and found other people were getting the same warning after changing the 12v so I didn't think too much about it. At the same time as the "Check hybrid system" warning came up we also got a tire pressure light warning. I checked the tire pressure and they were all within good range. So I added a small amount of air to each tire to be safe and it still showed the warning. So I tried to reset the tire pressure warning with the button under the steering column. It didn't work. I researched how to remove warning lights and found information on disconnecting the 12v battery and reconnecting. I did this and the tire pressure light and the "Check Hybrid System warning both disappeared. The car ran absolutely fine after this, the energy transfer system on the dash seemed to show normal transfer between all 3 systems. This led me to believe the car was fine.

About 2 weeks ago the check hybrid light system warning came on again, as well as the tire pressure light, and just about every other light on the dash. I figured this was an issue with the electrical system as just about every light was on and I don't see how that could realistically happen overnight to a car that is running just fine. So I decide to disconnect the 12v battery again, and I went and checked all of the fuses under the hood and under the steering column. Every fuse was perfectly fine, so I reconnected the battery and went to start the car and then nothing happened. It just would not start. When pressing the brake the green light on the start button would not light up. In fact nothing requiring electricity would work. None of the lights would come on, the key fob did not unlock doors, pretty much everything was out. Except the hazard lights and the windows would still roll down for some reason. So I checked the manual and was able to figure out to start the car with the silver toyota logo on the key fob on the start button with the brake depressed was able to get the green light to come on and was thankfully able to start the car. However when starting the car the "Check Hybrid system" warning is still on as well as all of the other dash warning symbols/lights.

So this is where I am currently. All warnings showing whenever the car is on, and I am only able to start the car with the key fob on the start button. I had the 12v battery checked at an autozone and it showed that it was basically brand new and in perfect condition. I even changed the battery on the key fob and that didn't change anything. I checked the fuses a second time and they are all good and installed correctly, none are loose. So it's not the key fob, not the 12v, not the fuses, I don't think its actually the hybrid system as this warning did not show until changing the 12v battery like others online have experienced as well. I will add that I drove the car earlier today around the block with all the warning lights on and again the car ran absolutely fine. I am at my wits end here. I have read through the manual so many times and nothing seems to help.

Any help that any of you can provide is greatly appreciated. I have been reading things on this forum nonstop the last 2 weeks trying to fix this so I am so grateful for all of your help up to this point and anything after. Thanks.

 

So I ordered a reader to check the codes and what I'm getting is "the vehicle has no fault codes" although all the warning lights are all still on.

 

Sorry. I was waiting for a scanner to get shipped before replying so I could have a more thorough response. Unfortunately the scanner shows no fault codes.