Prius will not start

Was that 12v measured at the jump point under the hood?

Do you have any obd2 codes (DTCs) that you can share with us here?

FYI : you're are being moderated until you've posted 5 times.

 

If the no start condition started immediately after the actuator replacement it is probably because something was not connected correctly or broken in the process. There should be some codes when you read the obd2 to help you start investigating. Try again the main hybrid battery orange plug and any connectors you disconnected removing the inverter to reach the actuator.

 

You do not need to start the engine to read codes. You just press the power button twice without touching the brake. Then you read the codes with techstream or another obd2 reader. I assume you used techstream to bleed the brake system after the actuator replacement. Do you get lights at the dash? Or it is completely dead?

 

Can you describe exactly what happens when you press the power button one time with no pressure on the brake pedal?

Next, exactly what happens when you press the power button one more time, still with no pressure on the brake pedal?

After the first press, are you able to use the radio?

After the second press, are you able to use the turn signals? Wipers? Washers? Does anything appear on the dash? Does anything not appear on the dash that you normally expect?

 

It is good to describe the things that happen as precisely as possible, and exactly which state you are trying.

ACC state: one power button push, no brake.

ON state: one more power button push after ACC, no brake.

"try to start" = READY state: power button pressed with foot on brake.

Are you able to try specifically and only ACC state, without trying to start, and report whether the radio can be used?

Are you able to try specifically and only ON state, without trying to start, and report whether the turn signals or windshield washers can be used?

Do you have a meter to check the voltage of the 12 volt battery?

 

Were you planning to perform a bleed procedure after changing the actuator? Why not connect a diagnostic tool and go to the ABS brake section's bleed menu and select the bleed function/actuator changed.

 

Are you able to attach a voltmeter at the jump point under the hood and measure the voltage excursion as you try pressing the button twice to reach ON mode?

Are you able to use the radio in ACC mode? You've given no answer to that yet.

 

Diagnostic Mode is not needed in order to attach an OBD scanner to the vehicle; as long as you can turn the ignition switch on it should be able to connect and read the ECU.

 

1. Make sure again 12v battery is good and has been load tested by a store like Advance Auto, pep boys etc. it’s free.
2. Check the positive post under the hood fuse box and ground reads a 12.3-12.8v with the 12v battery connected.
   
3. Check the am2 15 amp fuse is not blown.
   
4. Check the fusible link if it is blown.
   
5. Check the 5 amp and 120 amp fuses at the HV battery are not blown.
6. Check that the inverter high voltage orange cables are connected in the correct order and all other connectors click. Check inverter for signs of arching, shorting, smoke etc.
7. Remove the actuator connector and try. If dash lights up replace the shorted replacement actuator/abs pump.