Toyota CH-R Owners Manual: RCTA function
The RCTA functions when your vehicle is in reverse. It can detect other vehicles
approaching from the right or left rear of the vehicle. It uses radar sensors to
alert the driver of the other vehicle's existence through flashing the outside rear
view mirror indicators and sounding a buzzer.

- Approaching vehicles
- Detection areas
WARNING■Cautions regarding the use of the function
The driver is solely responsible for safe driving. Always drive safely,
taking care to observe your surroundings.
The RCTA function is only a supplementary function which alerts the driver
that a vehicle is approaching from the right or left at the rear of the vehicle.
As the RCTA function may not function correctly under certain conditions,
the driver's own visual confirmation of safety is necessary. Over reliance on
this function may lead to an accident resulting death or serious injury.
RCTA function detection areas
The areas that vehicles can be detected in are outlined below.

To give the driver a more consistent time to react, the buzzer can alert for
faster vehicles from farther away.
Example:

■The RCTA function is operational when The RCTA function operates
when all of the following conditions are met:
- The BSM system is set to on.
- The shift position is in R.
- Vehicle speed is less than approximately 5 mph (8 km/h).
- Approaching vehicle speed is between approximately 5 mph (8 km/h) and 18
mph (28 km/h).
■Conditions under which the RCTA function 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*
*: Depending on the conditions, detection of a vehicle and/or object may occur.
■Conditions under which the RCTA function may not function correctly
- The RCTA function may not detect vehicles correctly in the following situations:
- 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 backing up on a slope with a sharp change in grade

- When backing out of a shallow angle parking spot

- Immediately after the RCTA function is set to on
- Immediately after the engine is started with the RCTA function is set
to on
- When the sensors cannot detect a vehicle due to obstructions

- Instances of the RCTA function unnecessarily detecting a vehicle and/or
object may increase in the following situations:
- When a vehicle passes by the side of your vehicle
- When the parking space faces a street and vehicles are being driven
on the street

- When the distance between your vehicle and metal objects, such as a
guardrail, wall, sign, or parked vehicle, which may reflect electrical waves
toward the rear of the vehicle, is short
The BSM function uses radar sensors to detect the following vehicles traveling
in adjacent lanes and advises the driver of the presence of such vehicles via the
indicators on the outside rear view ...
To keep driving safety and performance, the following systems operate
automatically in response to various driving situations.
Be aware, however, that these systems are supplementary and should
...
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