Toyota PRIUS 50 2020 Series Owner's Manual page 305

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The BSM outside rear view mirror indicators visibility
When under strong sunlight, the outside rear view mirror indicator may be dif-
ficult to see.
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The Rear Cross Traffic Alert buzzer hearing
The Rear Cross Traffic Alert buzzer may be difficult to hear over loud noises
such as high audio volume.
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When "Blind Spot Monitor Unavailable" is shown on the multi-informa-
tion display
The sensor voltage has become abnormal, water, snow mud, etc., may be
built up in the vicinity of the sensor area of bumper (P. 304). Removing the
water, snow, mud, etc., from the vicinity of the sensor area bumper should
return it to normal. Also, the sensor may not function normally when used in
extremely hot or cold weather.
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When "Blind Spot Monitor System Malfunction Visit Your Dealer" is
shown on the multi-information display
There may be a sensor malfunction or misaligned. Have the vehicle
inspected by your Toyota dealer.
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Customization
The brightness of the outside rear view mirror indicators can be changed.
(Customizable features:P. 518)
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Certification for the Blind Spot Monitor
4-5. Using the driving support systems
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