Toyota PRIUS Owner's Manual page 401

NOTICE
■ When using Toyota parking assist-sensor
In the following situations, the system may not function correctly due to a
sensor malfunction etc. Have the vehicle checked by any authorized Toyota
dealer or repairer, or another duly qualified and equipped professional.
● Toyota parking assist-sensor operation display flashes, and a beep
sounds when no obstacles are detected.
●
If the area around a sensor collides with something, or is subjected to
strong impact.
●
If the bumper collides with something.
●
If the display shows up and remains on without a beep.
●
If a display error occurs, first check the sensor.
If the error occurs even when there is no ice, snow or mud on the sensor, it
is likely that the sensor is malfunctioning.
■
Notes when washing the vehicle
Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in the sensor malfunctioning.
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4-5. Using the driving support systems
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