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Discussion Starter #1
So I left my key in the ignition the other day so I could just turn the wheel while I was changing control arms due to a bad bushing. I ended up running the battery down and then jumped the car. Started up and decided to take for a spin to let alternator charge it up and it stalled out around 100 ft away from my house and when it did I took the key out and and the motor continued to run I think well at the very least the fan was running. I was not able to jump the car again and ended up towing my Yaris with my echo back to the house. I got the car to turn off by pulling the negative wire . Now when I put the key in and turn it to start nothing happens, doesn’t make a noise not even trying to start, when in the on position the turn signals work and everything seems to be working but when I try to pull the key out the car will not shut off and the fan in the engine bay turns on every time I try to start the car. I really need help on this as I have no idea what this could be I have tested the ignition relay and it is good. Any help would be greatly appreciated.
 

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If the host vehicle was running when you cranked the Yaris, it could be some serious trouble. If polarity was reversed even worse. No personal experience with this one but a warning, when jumping leave the host vehicle off to avoid overloading the charging system, Make absolutely certain the polarity is correct, seen it total one car.
 

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Discussion Starter #3
The host vehicle was running

Yeah it was running when it got hooked up for sure. What do you thing that means?
 

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You are putting a several hundred amp load on the charging system which it was never designed to handle, that is the host car. If polarity is reversed then you are feeding that amperage BACKWARDS through the car being jumped. That can short out the injectors and fry the computer as well as other things.

Do you see burn marks or craters on the battery terminals from the jump start. This would indicate polarity reversal. I don't want to predict what could happen, my knowledge is 2 decades old. The car was a 280ZX and it was jump started backwards, the injectors flooded the cylinders with liquid fuel, so they pushed it to 30 mph and dropped the clutch which bent three connecting rods, leaving 60 psi compression on 3 cylinders with practically no leakdown.

Now we have an engine to disassemble, a fuel injection system that has a lot of melted stuff including the CPU. This was the Colonels sons and his father told me I was a lying SOB when he got the estimate for $5k with out a firm bottom line, since you have to bring systems on line to see what else is messed up. He came and got his car, I called a cop to make sure I didn't kill his stupid ass and the son called me the next day to admit everything I had said was true, even though he watched the whole confrontation and his chickenshit father didn't have the balls to apologise.. An incident I'll never forget and one that convinced me to find another way to make money after 32 years. I started building houses and never looked back.

I'm glad the cop was there and glad I never fixed his car.

Basically you have to crawl through the malfunctioning systems, bringing them on line then continuing until everything works. This assumes the worst case scenario. I hope that is not your situation, but the crazy symptoms are a good indication.
 

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Hopefully it was just some relay or something of ignition/starter or something. I've never jumped a car with the host off. I know you are supposed to put the negative clamp on engine hook or safe metal/body area--which I admit, I never do.

That would suck if he did reverse polarity it and fried it. ECU, injectors, long long list of potentials I would imagine.
 

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Discussion Starter #7
Didn’t reverse polarities but still unsure of what’s going on with the car. I have tested all fuses and relays. I pulled the computer and cracked it open to look for damage and nothing. I can’t find any obvious damage anywhere had a mechanic plug diagnostic tool in and they said I should take it to the dealer. So not sure what I am gonna do .
 
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