TOYOTA 2010 Camry - Manual (Page 460)

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5-2. Steps to take in an emergency
*1
: Open door warning buzzer:
The open door warning buzzer sounds to alert the driver that one or more of
the doors or trunk is not fully closed (with the vehicle having reached a speed
of 3 mph [5 km/h]).
*
2
:Driver's and front passenger’s seat belt reminders:
The driver’s and front passenger’s seat belts reminder sound to alert the
driver and front passenger that his or her seat belt is not fastened. The
buzzer sounds intermittently for 10 seconds after the vehicle has reached a
speed of at least 12 mph (20 km/h). Then, if the seat belt is still unfastened,
the buzzer will sound at a different tone for 20 more seconds.