Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: System Description

SYSTEM DESCRIPTION

GENERAL

(a) The blind spot monitor system has a blind spot monitor function and RCTA function.

(1) Blind spot monitor function

  • The blind spot monitor function is a function that assists the driver when changing lanes.

    This function uses quasi-millimeter wave radar to detect vehicles that are traveling in adjacent lanes in the areas that are not visible using the outer rear view mirror assemblies (blind spots) and vehicles that are approaching rapidly from up to 60 m behind this vehicle in the areas that are not visible using the outer rear view mirror assemblies (blind spots).

    The function advises the driver of the existence of a vehicle by illuminating the outer rear view mirror indicator on the outer rear view mirror assembly.

  • If the turn signal switch is operated while the outer rear view mirror indicator on an outer rear view mirror assembly is illuminated, the indicator starts blinking to give additional warning to the driver.

(2) RCTA function

  • The RCTA function is a function that informs the driver a vehicle is approaching from the left or the right at the rear of the vehicle. The function uses quasi-millimeter wave radar to detect the position and relative speed of other vehicles. When the function determines that a vehicle is approaching this vehicle, this function informs the driver using the outer rear view mirror indicators and blind spot monitor buzzer.

FUNCTION OF COMPONENTS

Component

Function

Blind Spot Monitor Sensor

  • Consists of a 24 GHz radar module and an integrated processing module.
  • Illuminates or blinks the outer rear view mirror indicator on the outer rear view mirror assembly.
  • Sounds the RCTA buzzer (blind spot monitor buzzer) when the RCTA function is operating.
  • Changes the outer rear view mirror indicator on the outer rear view mirror assembly from illuminated to blinking when a turn signal switch operation signal is received from the combination meter assembly with the blind spot monitor function operating.
  • Dims the outer rear view mirror indicator on the outer rear view mirror assembly.
  • Displays the RCTA icon on the multi-display assembly when the RCTA function is operating.

Outer Rear View Mirror Assembly

  • Outer Mirror (Outer Rear View Mirror Indicator)

Turns on or blinks the indicator based on a signal from the blind spot monitor sensor.

Steering Pad Switch Assembly

Enables, disables or cuts off the operation of the blind spot monitor system by transmitting switch operation signals to the combination meter assembly.

RCTA Buzzer (Blind Spot Monitor Buzzer)

Sounds based on a signal from the blind spot monitor sensor.

Combination Meter Assembly

  • Multi-information Display
  • Transmits the ON/OFF signal to the blind spot monitor sensor LH.
  • Transmits a turn signal switch operation signal from the headlight dimmer switch assembly to the blind spot monitor sensor via CAN communication.
  • Displays an error message on the multi-information display if the blind spot monitor detects a malfunction while it is operating.

Main Body ECU (Multiplex Network Body ECU)

Transmits the destination information and the dimmer signal to the blind spot monitor sensor via CAN communication.

Skid Control ECU

Transmits the vehicle speed signal to the blind spot monitor sensor via CAN communication.

ECM

Transmits the shift position signal (R) to the blind spot monitor sensor via CAN communication.

Steering Sensor

Detects the angle of the steering wheel and transmits the resulting signals to the blind spot monitor sensor via CAN communication.

  • Airbag Sensor Assembly*1
  • Yaw Rate and Acceleration Sensor*2

Transmits the yaw rate signal to the blind spot monitor sensor via CAN communication.

Parking Assist ECU*3*4

Receives the blind spot monitor sensor information via CAN communication and sends it to the multi-display assembly.

Radio Receiver Assembly

  • Receives the blind spot monitor sensor information via CAN communication and sends it to the multi-display assembly.
  • Transmits the customize information on the multi-display assembly to the blind spot monitor sensor LH

Multi-display Assembly

  • Receives the video signals from the Radio receiver assembly, and displays RCTA icon on the display panel.
  • Receives the video signals from the parking assist ECU and displays RCTA icon on the display panel.*3
  • *1: for Optitron Meter Type
  • *2: for TFT Meter Type
  • *3: w/ Panoramic View Monitor System

OPERATION DESCRIPTION

(a) Operation description of the blind spot monitor function

(1) Operation conditions:

  • The blind spot monitor system is on.
  • The shift lever is in any position other than R.
  • Vehicle speed is more than approximately 16 km/h (10 mph).

(2) Conditions in which a sensor can detect a vehicle

The blind spot monitor function indicates detection of a vehicle in the detection area when either condition is met:

  • When a vehicle is detected in an adjacent lane overtaking this vehicle.
  • When a vehicle is detected entering the detection area because it changed lanes.

HINT:

The greater the difference in speed between the vehicle and the detected vehicle is, the farther away the other vehicle will be when the notification is given.

(3) Detection area

Vehicles in the following areas can be detected:

*a

Within Approx. 3.5 m (11.48 ft) from Side of Vehicle

*b

Within Approx. 1 m (3.28 ft) Forward of Rear Bumper

*c

Within Approx. 3 m (9.84 ft) Behind Rear Bumper

*d

Within Approx. 3 m (9.84 ft) to 60 m (196.86 ft) from Rear Bumper

Detection Area (for Vehicle in Blind Spot)

Detection Area (for Rapidly Approaching Vehicle from Behind)

(b) Operation description of the RCTA function

(1) Operation conditions:

  • The blind spot monitor system is on.
  • The shift lever is in R.
  • The vehicle speed is less than approximately 8 km/h (5 mph).

(2) Conditions in which a sensor can detect a vehicle

The RCTA function indicates detection of a vehicle in the detection area when both conditions are met:

  • A vehicle is approaching from the right or left at the rear of the vehicle.
  • The vehicle speed is approximately 8 km/h (5 mph) to 28 km/h (17 mph).

(3) Detection area

Vehicles in the following areas can be detected:

*a

Within Approx. 5.5 to 20 m (18.05 to 65.62 ft) from Side of Vehicle (detection area changes according to vehicle speed)

*b

Within Approx. 6 m (19.69 ft) Behind Rear Bumper

Detection Area

OPERATION OF OUTER REAR VIEW MIRROR INDICATOR AND RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Initial check

(1) When the blind spot monitor system is turned on with the engine switch on (IG), the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 1 second.

(2) When the engine switch is turned from off to on (IG) with the blind spot monitor system on, the outer rear view mirror indicators on the outer rear view mirror assembly illuminate for 3 seconds.

(b) Operation for each function

(1) Operation for blind spot monitor function

  • When a sensor detects a vehicle in the blind spot area or a vehicle is rapidly approaching the blind spot from behind the vehicle, the outer rear view mirror indicator on the outer rear view mirror assembly illuminates.
  • If the turn signal switch is operated, while the sensor is detecting a vehicle in the detection area and the outer rear view mirror indicator on the outer rear view mirror assembly is illuminated, the indicator starts blinking as shown in the illustration.

(2) Operation for RCTA function

  • When all of the operation conditions for the RCTA function are met, the outer rear view mirror indicators on the outer rear view mirror assembly blink for 2.5 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 2.3 seconds as shown in the illustration.

*a

0.125 Seconds

*b

2.5 Seconds

*c

0.1 Seconds

*d

0.4 Seconds

*e

2.3 Seconds

-

-

RCTA ICON OUTLINE

(a) If a vehicle approaching from the right or left at the rear of the vehicle is detected, the icon on the detected side will illuminate.

*A

for 12.3 Inch Display

*B

for 8 Inch Display (w/ Panoramic View Monitor System)

*a

Example

*b

RCTA Icon

*c

When panoramic view screen not displayed

*d

When panoramic view screen displayed

    System Diagram
    SYSTEM DIAGRAM ...

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the blind spot monitor system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

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