Toyota FORTUNER 2021 Owner's Manual page 289

Conditions under which the system will not detect a vehicle
The RCTA function is not designed to detect the following types of vehicles
and/or objects:
Vehicles approaching from directly behind
Vehicles backing up in a parking space next to your vehicle
Vehicles that the sensors cannot detect
due to obstructions
Guardrails, walls, signs, parked vehicles and similar stationary objects
Small motorcycles, bicycles, pedestrians, etc.
Vehicles moving away from your vehicle
Vehicles approaching from the parking spaces next to your vehicle
The distance between the sensor and approaching vehicle gets too close
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: Depending on the conditions, detection of a vehicle and/or object may
occur.
Situations in which the system may not operate properly
The RCTA function may not detect vehicles correctly in the following situa-
tions:
When the sensor is misaligned due to a strong impact to the sensor or its
surrounding area
When mud, snow, ice, a sticker, etc., is covering the sensor or surrounding
area on the rear bumper
When driving on a road surface that is wet with standing water during bad
weather, such as heavy rain, snow, or fog
When multiple vehicles are approaching with only a small gap between
each vehicle
When a vehicle is approaching at high speed
When equipment that may obstruct a sensor is installed, such as a towing
eyelet, bumper protector (an additional trim strip, etc.), bicycle carrier, or
snow plow
4-5. Using the driving support systems
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