2010 Prius no start, no ready mode, nothing.

Hello, I've got a 2010 Prius that has me stumped. To start, it has 128k miles on the ODO, and it doesnt get driven much. Maybe 10k miles a year. Im new to this forum and its the reason why i made this account.

What it did is that it decided not to start one morning. Could not lock or unlock with the fob. Does not show a green ready mode light when the brakes are applied. Cannot get into acc mode, no lights pop up except for the orange triangle. The only messages that show up are "Depress brake pedal. Place keyfob on start button to start". Nothing happens. Dome lights work and that part of the IC(instrument cluster) is the only part of the car that turn on. Car does have a refurbished hybrid battery, but it is 3 years old and out of warranty.

What i have done and checked:

• New 12v battery(AGM)
• Multiple new batteries on key fob(locks still dont work)
• Checked all fuses, including 125A and 140A
• Checked and rechecked orange hybrid plug.

This started a month ago and the 12v has been charged and load checked multiple times to make sure i had good voltage at all times. The "Check hybrid system" message never showed up. I could not check for codes since i am not able to even turn the vehicle onto vehicle start mode. I am mechanically inclined, so ask away. Ive dealt with electrical issues in the past but this is my first time dealing with hybrid systems. I dont know what the next step is so any and all input is appreciated. I havent taken a hybrid battery apart, but i aint no chicken. I just would rather avoid it lol

Thank you.

 

Hey yall sorry it took me a while to reply. But yeah i have 12.7v at the battery. 12.5v at the thick white wire, and 12.5v at the jump post. And i have double checked all fuses inside and out. Im thinking maybe the ecu took a crap but im just making guesses at this point. Ive checked all my ground points and they look clean and tight. All my positive points are the same.

 

Hey Eddie25, yes sadly there is only one key fob. And wierdly enough the pump can be heard everytime when the driver door gets opened. Never really heard it go off as i approached it, but it does run when the pedal gets depressed too. But even when the pedal gets depressed, no amber light shows up on the start button. Ive tried pressing the fob on the button without the brake pedal and still no response. I have tried calling a locksmith to get a new fob but his machine couldn't program the fob. It refused to connect. The dealership is my last resort as i would like to figure this out personally. But if i have to, it is what it is.

 

Is 12.5v too low even for the door locks and instrument cluster to light up?

 

Hey sorry for not replying any sooner. Had to step away from the car for a bit for family related issues. But i did check for a draw and i could not find anything super significant. I have so far checked junction connectors and ground points. Cleaned a few ground points just to have a peace of mind. I did actually check the hybrid battery and it check out as well. My main issue. is that it does not want to go into accessory mode or even ign-on mode. all it does is say, step on brake pedal and push power button with key fob. no amber light comes on and no green light comes on. when the power button gets pushed, it just repeats the message, over and over. the orange triangle also starts blinking while the message is being repeated. key fob still doesn't unlock or lock the car. But it does lock and unlock using the door lock. ive only got one key fob. and the ive had a locksmith try and program a new fob but he could not get it to program. The main harness is good. ive check for continuity between the certification ecu to the power button, and the power management ecu. at this moment ive ran out of ideas of what it could be and playing parts roulette till it works is turning into a viable option.