Toyota 2015 Prius Owner's Manual page 510

5-2. Steps to take in an emergency
* 1
: 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 [5 km/h]).
*
2
: Seat belt warning buzzer:
The driver's and front passenger's seat belts reminder sounds 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 in a different tone for 20 more seconds.
SRS warning light
■
This warning light system monitors the airbag sensor assembly, front impact
sensors, side impact sensors (front door), side impact sensors (front), side
impact sensors (rear), driver's seat position sensor, driver's seat belt buckle
switch, front passenger occupant classification system (ECU and sensors),
"AIR BAG ON" indicator light, "AIR BAG OFF" indicator light, front passen-
ger's seat belt buckle switch, seat belt pretensioner assemblies, airbags,
interconnecting wiring and power sources. (P. 141)
Front passenger occupant classification system (ECU and sensors),
■
seat belt reminder and warning buzzer
●
If luggage is placed on the front passenger seat, the front passenger
occupant classification system (ECU and sensors) may cause the warn-
ing light to flash and the warning buzzer to sound even if a passenger is
not sitting in the seat.
●
If a cushion is placed on the seat, the front passenger occupant classifi-
cation system (ECU and sensors) may not detect a passenger, and the
warning light may not operate properly.
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