Lexus RX (RX 350L, RX450h) 2016-2023 Owners Manual – RCTA function

Lexus RX (RX 350L, RX450h) 2016-2023 Owners Manual / Driving / Using the driving support
systems / BSM (Blind Spot Monitor) / 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.

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.

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

Example:

■ 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

• 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

• When backing out of a shallow angle parking
  spot

• 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

• 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

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.

BSM function

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 …

Intuitive parking assist

The distance from your vehicle to a nearby wall or other stationary
object
when parallel parking or maneuvering into a garage is measured by the sensors
and communicated via the displays and a buz …

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Lexus car safety: monitoring systems

Lexus develops its vehicles and technology under the umbrella of Toyota Motor Corporation’s (TMC) ‘Integrated Safety Management Concept’, one part of a three-pronged approach which involves continual improvement in vehicle safety as well as initiatives to improve driver and pedestrian awareness and to create a safe traffic environment.

TMC’s eventual aim is to realise a society where traffic accidents are a thing of the past, which is why decades of research into safety technologies have resulted in Lexus cars receiving consistently high results in Euro NCAP crash safety tests, with the CT and IS achieving the maximum five-star award.

In this post, we take a look at Lexus’ various monitoring systems that keep a close eye on the surroundings when you are parking and driving:

Parking sensors
Rear-View Camera
Blind Spot Monitor (BSM)
Rear Cross Traffic Alert (RCTA)
Adaptive Cruise Control (ACC)
Lane Departure Warning (LDW)
Lane Keep Assist (LKA)
Driver Monitoring System

Parking sensors
To ease parking the vehicle, Lexus equips all its models with ultrasonic parking sensors that use sound waves to detect obstacles, indicating the proximity of the obstacle by means of a beeping alarm. This system can help to prevent low-speed impacts when parking, avoiding potentially costly repairs.
All Lexus cars (except CT 200h ‘S’ models) can be bought with parking sensors, fitted as part of the standard equipment in the majority of cases. Dependent on specification, sensors may be fitted to the rear or both front and rear.

Rear-View Camera
As well as parking sensors, Lexus also utilises Toyota Motor Corporation-developed rear-view cameras to a number of models. The view from the camera is displayed on the in-dash display, overlaid with guidance lines that indicate distance. This system aids parking and prevents collisions with unseen objects behind the vehicle.
All Lexus vehicles can be specified with a rear-view camera.

Blind Spot Monitor (BSM)
Blind Spot Monitor (BSM) is one of Lexus’ latest safety monitoring systems, using radar sensors to constantly observe the area in the driver’s blind spot for the presence of other vehicles. If the turn indicator is activated, BSM warns the driver by activating an indicator in the door mirror on the appropriate side of the vehicle.

The Blind Spot Monitor system is currently available on Premier grade IS models, as well as the Lexus GS, RX 450h and new Lexus NX luxury crossover.

Rear Cross Traffic Alert (RCTA)
Using the same sensors as Blind Spot Monitor, the Rear Cross Traffic Alert (RCTA) system warns the driver of unseen vehicles approaching from either side that aren’t visible through the rear screen or mirrors, such as when reversing out of a parking space. If a vehicle is detected, RCTA sounds a warning and flashes the warning lights in the door mirrors.
Like Blind Spot Monitor, the RCTA system is available on Premier grade IS models, the Lexus GS, RX 450h and new Lexus NX luxury crossover.

Adaptive Cruise Control (ACC)
Adaptive Cruise Control (ACC) adds an extra layer of safety to conventional cruise control, the system by which a car drives at a constant speed set by the driver. First used in 1997, Lexus added a radar-monitoring system to the cruise control system to create Adaptive Cruise Control which can alter your car’s speed based on the speed of vehicles travelling ahead. When a slower-moving vehicle is detected, ACC automatically reduces your car’s speed (activating the brakes if necessary) to maintain a safe distance between the two vehicles. If the vehicle in front turns off or speeds up, then ACC will accelerate your car up to its previous cruising speed.

Adaptive Cruise Control is available on most Lexus models, either fitted as standard or as an optional upgrade.

Lane Departure Warning (LDW)
Lane Departure Warning (LDW) as been part of Lexus’ line up of safety technologies since 2002. The system uses two cameras mounted behind the rear-view mirror to continually monitor vehicle position in relation to road lane markings. If it detects that the car is drifting out of its lane, LDW triggers an audible and visual warning for the driver to take corrective action.

Lane Departure Warning is fitted as an optional upgrade on IS, GS and LS models.

Lane Keep Assist (LKA)
Lane Keep Assist (LKA) was introduced in 2004 as an extension of the Lane Departure Warning system. The LKA system activates if it detects that the driver isn’t responding to the lane departure warnings, and will actually apply corrective steering without driver input to maintain a safe course.

Like Lane Departure Warning, Lane Keep Assist is an optional upgrade on IS, GS and LS models.

Driver Monitoring System
A technology used as part of the Advanced Pre-Crash Safety (A-PCS) system, the Driver Monitoring System constantly monitors the movement of the driver’s head and eyes to detect if the driver is not watching the road ahead. If the system detects that the driver’s head has turned to the side for a few seconds or that their eyes are closed, the Driver Monitoring System will automatically bring forward the pre-crash alarm. If the situation persists, the system will briefly apply the brakes, and if there is no immediate action from the driver, all A-PCS systems will in an attempt to avoid an accident.

Lexus’ Driver Monitoring System is integrated into the Advanced Pre-Crash Safety System available on the Lexus GS 450h and LS 600h L.

To learn more about other Lexus safety technologies, see these related posts:

Braking technologies
Stability and control technologies
Occupant safety
Safety through convenience

By Andrew Biddle

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