Lexus RX Owners Manual (RX450h): RCTA function

The RCTA function uses radar sensors to detect vehicles approaching from the right or left at the rear of the vehicle and alerts the driver of the presence of such vehicles by flashing the outside rear view mirror indicators and sounding a buzzer.

Lexus RX. Using the driving support systems

  1. Approaching vehicles
  2. Detection areas of approaching vehicles

■ Rear Cross Traffic Auto Brake function When the Intelligent Clearance Sonar with Rear Cross Traffic Auto Brake is enabled and a vehicle approaching from the right or left at the rear of the vehicle is detected, the Rear Cross Traffic Auto Brake function will perform brake control to reduce the likelihood of an impact with the approaching vehicle.

■ RCTA icon display When a vehicle approaching from the right or left at the rear of the vehicle is detected, the following will be displayed on the audio system screen.

Display

Content

A vehicle is approaching from the left at the rear of the vehicle
A vehicle is approaching from the right at the rear of the vehicle
Vehicles are approaching from both sides of the vehicle
The RCTA function is malfunctioning

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.

Lexus RX. Using the driving support systems

The buzzer can alert the driver of faster vehicles approaching from farther away.

Example:

Lexus RX. Using the driving support systems

■ The RCTA function is operational when The RCTA function operates when all of the following conditions are met:

  • The RCTA function is on.
  • The shift lever is in R.
  • The vehicle speed is less than approximately 5 mph (8 km/h).
  • The 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

Lexus RX. Using the driving support systems

  • 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 towing a trailer (vehicles with towing package)
  • When backing up on a slope with a sharp change in grade

Lexus RX. Using the driving support systems

  • When backing out of a shallow angle parking spot

Lexus RX. Using the driving support systems

  • Immediately after the RCTA function is turned on
  • Immediately after the hybrid system is started with the RCTA function on
  • When the sensors cannot detect a vehicle due to obstructions

Lexus RX. Using the driving support systems

  • 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

Lexus RX. Using the driving support systems

  • 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

Setting up BSM function/RCTA function

You can change the BSM function/RCTA function settings.

1. Press the "MENU" button on the Remote Touch, and then select on the screen.

2. Select "Vehicle", and then select "Blind Spot Monitor Settings" on the screen.

3. Select the desired setting.

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    Lexus RX Owners Manual (RX450h)

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