2012 Toyota Prius Owners Manual - Page 496

2-1. Driving procedures STEP 4 Check that the "READY" indicator is on. If the "READY" indicator changes from a flashing light to a solid light and the buzzer sounds, the hybrid system is starting normally. The vehicle will not move when the "READY" indicator is off. The vehicle can move when the "READY" indicator is on even if the engine is stopped. (The gasoline engine starts or stops automatically in accordance with the state of the vehicle.) 2