2012 Toyota Prius Owners Manual - Page 770

5-2. Steps to take in an emergency *1: Refer to the separate "Scheduled Maintenance Guide" or "Owner's Manual Supplement" for the maintenance interval applicable to your vehicle. * 2 : Open door warning buzzer: The open door warning buzzer sounds to alert one or more of the doors is not fully closed (with the vehicle having reached a speed of 3 mph [5km/h]). *3: Seat belt warning buzzer: The seat belt warning buzzer sounds to alert the driver and/or front passenger that their seat belts are not fastened. If the driver's seat belt is not fastened, the buzzer will sound for 6 seconds once the "POWER" switch is turned to ON mode. If the vehicle reaches a speed of 12 mph (20 km/h), the buzzer will sound once. If the seat belt is still unfastened after 30 seconds, the buzzer will sound intermittently for 10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound in a different tone for 20 more seconds.