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Home >> Lexus >> 2021 >> NX 300h Base >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Dynamic Radar Cruise Control System - Diagnostics - Introduction >> Dynamic Radar Cruise Control System >> Road Test [09/2017 - 05/2019] >> Road Test [09/2017 - 05/2019]
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Road Test [09/2017 - 05/2019]

  1. PROBLEM SYMPTOM CONFIRMATION 

    HINT: 

    • The dynamic radar cruise control system has 2 cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.
    • Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control main switch.
    1. Inspect the SET function.
      Fig 1: Cruise Control Main Switch (On/Off Button)
      GTY794073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ON/OFF
      *b -SET
      1. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
      2. Check that the cruise control indicator light illuminates in the combination meter assembly.
      3. Drive at a speed between approximately 50 km/h (31 mph) or more.
      4. Push the cruise control main switch to -SET.
        Fig 2: Cruise Control Switch To -/SET
        GTY814886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Cruise Control Indicator (Vehicle-to-vehicle Distance Control Mode)
        *2 Cruise Control SET Indicator
      5. Check that the cruise control indicator remains illuminated, the cruise control SET indicator illuminates in the combination meter assembly and the set speed is displayed on the multi-information display.
      6. After releasing the switch, check that the vehicle maintains the set speed.
    2. Inspect the + (ACCEL) function.
      1. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
        Fig 3: Cruise Control Main Switch (On/Off Button)
        GTY794073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a ON/OFF
        *b -SET
      2. Drive at a speed between approximately 50 km/h (31 mph) or more.
      3. Push the cruise control main switch to -SET.
      4. Check that vehicle speed increases while the cruise control main switch is pushed to +RES, and that the vehicle maintains the newly set speed when the switch is released.
        Fig 4: Cruise Control Main Switch Is Pushed To +RES
        GTY812686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a +RES
      5. Push the cruise control main switch to +RES and then release it immediately. Check that the vehicle speed increases* (tap-up control).

        HINT: 

        *: Constant speed control mode: increases by approximately 1 km/h or 1 mph; vehicle-to-vehicle distance control mode: increases by approximately 1 km/h or 1 mph.

    3. Inspect the - (COAST) function.
      1. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
        Fig 5: Cruise Control Main Switch (On/Off Button)
        GTY794073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a ON/OFF
        *b -SET
      2. Drive at a speed between approximately 50 km/h (31 mph) or more.
      3. Push the cruise control main switch to -SET.
      4. Check that vehicle speed decreases while the cruise control main switch is pushed to -SET, and that the vehicle maintains the newly set speed when the switch is released.
        Fig 6: Cruise Control Main Switch Is Pushed To -SET
        GTY790865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a -SET
      5. Push the cruise control main switch to -SET, and then release it immediately. Check that the vehicle speed decreases* (tap-down control).

        HINT: 

        *: Constant speed control mode: decreases by approximately 1 km/h or 1 mph; vehicle-to-vehicle distance control mode: decreases by approximately 1 km/h or 1 mph.

      4. Fig 7: Cruise Control Main Switch (On/Off Button)
      GTY794073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. *a ON/OFF
      *b -SET

      Inspect the CANCEL function.

      1. Turn the dyanmic radar cruise control system on using the cruise control main switch (ON/OFF).
      2. Drive at a speed between approximately 50 km/h (31 mph) or more.
      3. Push the cruise control main switch to -SET.
      4. When any of the following are performed, check that control of vehicle speed by the dynamic radar cruise control system is canceled and that the normal driving mode (no control of vehicle speed by the dynamic radar cruise control system) resumes.
        Fig 8: Cruise Control Main Switch To Cancel
        GTY805057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a CANCEL
        • Depressing the brake pedal.
        • Moving the shift lever from D or S to any other position.
        • Selecting the S3, S2 or S1 range with the shift lever in S.
        • Pulling the cruise control main switch to CANCEL
        • Turning the dynamic radar cruise control system off using the cruise control main switch (ON/OFF) (The stored vehicle speed in the hybrid vehicle control ECU is not maintained.).
        • Applying the electrical parking brake (only during vehicle-to-vehicle distance control mode).
    5. Inspect the RES (RESUME) function.
      1. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
        Fig 9: Cruise Control Main Switch (On/Off Button)
        GTY794073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a ON/OFF
        *b -SET
      2. Drive at a speed between approximately 50 km/h (31 mph) or more.
      3. Push the cruise control main switch to -SET.
      4. Cancel control of vehicle speed by the dynamic radar cruise control system by performing any of the CANCEL functions (other than turning the dynamic radar cruise control system off using the cruise control main switch (ON/OFF)).
      5. Push the cruise control main switch to +RES while driving the vehicle at a speed of more than approximately 50 km/h (31 mph), and check that the vehicle resumes the speed set prior to cancellation and that the cruise control SET indicator illuminates.

        HINT: 

        The stored vehicle speed is retained even if vehicle speed drops below approximately 40 km/h (25 mph). The previously stored vehicle speed can be resumed by pushing the cruise control main switch to +RES when the vehicle speed has returned to approximately 40 km/h (25 mph) or more.

        Fig 10: Cruise Control Main Switch To +RES
        GTY835505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a +RES
  2. CHECK FULL-SPEED RANGE FOLLOWING FUNCTION 
    1. Check cruise control setting
        Fig 11: Cruise Control Main Switch (ON/OFF)
        GTY524803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. *a ON/OFF

        Turn the cruise control system on using the cruise control main switch (ON/OFF button).

      2. Drive at a speed between approximately 0 km/h (0 mph) and 180 km/h (110 mph).
      3. Check that there is a preceding vehicle that can be tracked.

        HINT: 

        Tracking control may not track the preceding vehicle in the following conditions:

        • The rear of the preceding vehicle is small, such as an empty trailer or motorcycle.
        4. Fig 12: Push The Cruise Control Main Switch To -SET
        GTY530193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. *a -SET

        Push the cruise control main switch to -SET.

      5. When the switch is released, check that tracking of the preceding vehicle begins with the set vehicle speed lower limit (45 km/h (28 mph)) or higher set vehicle speed as the upper limit.
      6. Check that the set vehicle speed is displayed on the multi-information display in the combination meter assembly.
    2. Check deceleration function
      1. When the preceding vehicle decelerates, check that the vehicle automatically decelerates while maintaining the set vehicle-to-vehicle distance.
      2. When the vehicle stops, check that "WAITING" is displayed on the multi-information display in the combination meter assembly.

        HINT: 

        When "WAITING" is displayed on the multi-information display in the combination meter assembly, even if the brake pedal is depressed, tracking control is not canceled.

    3. Check acceleration function
      1. When the preceding vehicle starts off, check that "PRECEDING VEHICLE MOVEMENT/Operate Cruise Lever or Accelerator Pedal to Resume" is displayed on the multi-information display in the combination meter assembly.
      2. When the cruise control main switch is pushed to +RES or the accelerator pedal is depressed, check that tracking control resumes and begins tracking the preceding vehicle.
        Fig 13: Cruise Control Main Switch Is Pushed To +RES
        GTY535750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a +RES
    4. Check tracking control cancel function
      1. When the vehicle speed is approximately 40 km/h (25 mph) or less and the preceding vehicle is no longer in front of the vehicle, check that "CRUISE NOT AVAILABLE/No Preceding Vehicles" is displayed on the multi-information display in the combination meter assembly, the warning buzzer sounds 4 times and tracking control cancels.

        HINT: 

        Tracking control also automatically cancels when the preceding vehicle moves out of the detection range due to a curve, etc., when the vehicle speed is 40 km/h (25 mph) or less.

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