If your Toyota Prius won’t start when you push the start button, but some of the dashboard lights come on and it makes some sounds, but not all of the lights come on, then you have a weak battery. The Toyota Prius won’t start if its 12 V battery is low on voltage. The Prius has two batteries, a 12 V regular car battery, and a hybrid battery. When the 12 V car battery starts getting old, sometimes your Prius won’t start when you push the start button, but parts of the dashboard light up and some parts don’t. if you turn on the cabin lights and noticed that they are dim, then you definitely have a low battery. And that is why your Toyota Prius won’t start. How to fix a Toyota Prius that won’t start because of a low battery, you need to charge up the battery, replace the battery, or jumpstart the car. In this video I show you how to jumpstart a Toyota Prius if the battery is low. I also show you where the 12 V battery is located in the back of the car. I hope this helps you fix your Toyota Prius if it won’t start, but it does turn on and make some noises.