2011 Toyota Prius Owners Manual - Page 547

5-2. Steps to take in an emergency Warning message Details EV-Drive Mode cannot be switched to. A buzzer also sounds. The EV-Drive Mode has been automatically cancelled. A buzzer also sounds. Correction procedure Use the EV-Drive Mode when it becomes available. Drive normally for a short time. n After changing the engine oil (U.S.A. only) Make sure to reset the oil maintenance data. (→P. 440) n Approach warning message In the following instances, there is the possibility that the approach warning will not activate even when the vehicle-to-vehicle distance decreases. l When your vehicle and the vehicle ahead are traveling at the same speed or the vehicle ahead is traveling more quickly than your vehicle. l When the vehicle ahead is traveling at very low speed. l Immediately after cruise control speed is set. l At the instant the accelerator pedal is depressed. When trouble arises 525 5 PRIUS_U (OM47685U) DVD