System Description [12/2017 - 10/2020]

1. The parking support alert system has a static objects function, rear crossing vehicles function, and rear pedestrians.
   1. Parking Support Alert (static objects) function
      1. This function uses ultrasonic sensors to detect any obstacles at the corners and the rear of the vehicle. The function then informs the driver of the distance between the sensors and an obstacle as well as their positions by indicating them on the multi-information display (on the combination meter assembly), multi-display (on the multi-display) and by sounding a buzzer.
   2. Parking Support Alert (rear crossing vehicles) function
      1. This function is a function that informs the driver of an approaching vehicle from diagonally behind. The function uses quasi-millimeter wave radar to detect the positions of and relative speed to a vehicle. When the function determines that a vehicle is approaching this vehicle, this function informs the driver of it using the indicators and buzzer.
   3. Parking Support Alert (rear pedestrians) function
      1. This function is if the rear television camera assembly detects a pedestrian when the shift position is in R, the rear camera detection function displays a pedestrian detection icon on the multi-display and sounds the rear camera detection buzzer (blind spot monitor buzzer) to warn the driver.

1. *1: w/ Panoramic View Monitor System
2. *2: w/ Parking Assist Monitor System
3. *3: w/ Headup Display System
4. *4: w/ Vacuum Brake Booster
5. *5: w/o Vacuum Brake Booster

1. The operating conditions of each ultrasonic sensor differ according to the installation position as shown in the table below.

   Installation Position	Operating Condition
   Front Corner	Engine is running. Static objects function is on. Shift position in any position other than P. Vehicle speed is less than approximately 10 km/h (6 mph).
   Front Center	Engine is running. Static objects function is on. Shift position in any position other than P or R. Vehicle speed is less than approximately 10 km/h (6 mph).
   Rear Corner	Engine is running. Static objects function is on. Shift position is in R. Vehicle speed is less than approximately 10 km/h (6 mph).
   Rear Center

   When the system operates, the clearance warning ECU assembly transmits ultrasonic waves from the ultrasonic sensors. If these waves encounter an obstacle within one or more of the sensors ranges, the waves are reflected back to the sensors, which transmit them to the clearance warning ECU assembly.

   Based on this information, the clearance warning ECU assembly sends signals to the radio receiver assembly, the combination meter assembly and the No. 1 clearance warning buzzer and No. 2 clearance warning buzzer. The approximate distance between the vehicle and the obstacle is then indicated, and the buzzer sounds.

   HINT: 

   Refer to Detection Range Measurement and Display Inspection.

   Refer to OPERATION CHECK [12/2017 - 10/2020] 

HINT: 

• Allocation refers to the process of the clearance warning ECU assembly setting aside IDs for the sensors.
• The vehicle has the sensors arranged in 2 groups. There is a front series and a rear series. The sensors are connected in a "daisy chain".

1. Initialization mode:

   An ID is allocated to each sensor and sensor diagnosis is performed.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. When the initial check is operating (the engine switch is on (IG) and the static objects function is on), the clearance warning ECU assembly provides power to the first sensors in each series (front left sensor and rear right sensor).
   2. After the power is supplied, the front left sensor and rear right sensor enter standby mode to receive an ID from the ECU. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to these sensors.
   3. The front left sensor and rear right sensors receive the ID allocation signal from the ECU and perform self-diagnosis. When the sensor self-diagnosis is complete, the ECU sends an ID allocation confirmation signal to the sensors.
   4. After the ID allocation confirmation is performed, the ECU provides power to the second sensors in each series (front left center sensor and rear right center sensor) via the first sensors. In the same manner as the first sensors, the second sensors enter standby mode. When a certain amount of time has elapsed, the ECU sends an ID allocation signal to the second sensors.
   5. The above operation will be repeated until an ID is allocated to the last sensor (front right sensor or rear left sensor). Initialization ends when ID allocation to all ultrasonic sensors is completed.
2. Detection mode:

   After initialization mode is completed, the system switches to detection mode. In detection mode, the clearance warning ECU assembly sends information request signals and sensor activation signals to the ultrasonic sensors and receives detection result signals from the sensors.

   1. The ECU regularly sends ID signals, information request signals, and sensor activation signals to each ultrasonic sensor according to the communication schedule.
   2. When a certain amount of time has elapsed (sensor detection operation is completed), the ECU sends an ID signal to the sensor to receive a detection result signal.
   3. The ultrasonic sensor sends a detection result signal or detection information signal to the ECU.
   4. The above operation is performed repeatedly for each ultrasonic sensor.

1. Operation description of the RCTA function
   1. Operation conditions:
      • The RCTA function is on.
      • The shift position 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 this vehicle from diagonally behind.
      • The vehicle speed is approximately 8 km/h (5 mph) to 28 km/h (18 mph).
   3. Detection area

      Vehicles in the following areas can be detected:

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Within approximately 5.5 to 20 m (18.04 to 65.6 ft.) from Side of Vehicle (detection area changes according to vehicle speed)
      *b	Within approximately 6 m (19.68 ft.) Behind Rear Bumper
      	Detection Area

1. 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 mirror actuator 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 mirror actuator assembly illuminate for 3 seconds.
2. Operation for each function
   1. 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 mirror actuator assembly blink for 2.5 seconds and the RCTA buzzer (blind spot monitor buzzer) sounds for 2.3 seconds as shown in the illustration.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	0.125 Seconds	*b	2.5 Seconds
      *c	0.1 Seconds	*d	0.4 Seconds
      *e	2.3 Seconds	-	-

1. Operation description of the rear camera detection function
   1. Operation conditions:
      • The engine switch on (IG).
      • The shift position is in R.
   2. Detection Area

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Detection Area
      	Detection Area A
      	Detection Area B
      	Detection Area C

      Detection Area	Buzzer Operation	Pedestrian Detection Icon
      A	Sounds repeatedly	Blinks 3 times and then stays on
      B	When the vehicle is stationary: Sounds 3 times When the vehicle is backing up: Sounds repeatedly	Blinks 3 times and then stays on
      C	When it is determined that a pedestrian will enter area A within a few seconds: Sounds repeatedly	When it is determined that a pedestrian will enter area A within a few seconds: Blinks 3 times and then stays on

      HINT: 

      • Absolute Detection Area (3.0 m (9.8 ft.) from the edge of bumper, 3.0 m (9.8 ft.) wide)

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        *a	Edge of Bumper
        	Absolute Detection Area

      • Absolute No Detection Area (4.1 m (13.4 ft.) from the edge of the bumper, 7.2 m (23.6 ft.) wide)

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        *a	Edge of Bumper
        	Absolute No Detection Area