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Vehicle Control History [05/2019 - ]

WARNING: This page is about a different car, the 2021 Lexus NX 300h, 2020 Lexus NX 300h, and 2019 Lexus NX 300h. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

When checking the Vehicle Control History, make sure to record the output codes. Then, clear the Vehicle Control History (RoB) and check it again.

  1. CHECK VEHICLE CONTROL HISTORY (FRONT RADAR SENSOR SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Front Radar Sensor / Utility / Vehicle Control History (RoB).

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Vehicle Control History (RoB)
      VEHICLE CONTROL HISTORY (ROB)

      Multi-information Display Code Tester Display Description Diagnostic Note
      Pre-Collision System Malfunction Visit Your Dealer X2023 Front Radar Sensor Optical Axis Not Adjusted History of millimeter wave radar sensor assembly beam axis not being adjusted. If this Vehicle Control History code is stored, clear the Vehicle Control History (RoB) after performing front beam axis adjustment, and then check that this code is not output again.
      Refer to ADJUSTMENT [05/2019 - ]
      Pre-Collision System Unavailable X2024 Front Radar Sensor Temporary Unavailable (Vertical Direction Optical Axis Misalignment) History of millimeter wave radar sensor assembly beam axis misalignment (vertical). Stored when the vehicle is being driven and the vertical beam axis is calibrated.
      Pre-Collision System Unavailable X2025 Front Radar Sensor Temporary Unavailable (Horizontal Direction Optical Axis Misalignment) History of millimeter wave radar sensor assembly beam axis misalignment (horizontal). Stored when the vehicle is being driven and the horizontal beam axis is calibrated.
      Pre-Collision System Unavailable Clean Sensor X2026 Front Radar Sensor Dirt History of system operation being temporarily suspended due to millimeter wave radar sensor assembly not being able to detect objects. Check if any of the following conditions are met:
      • A non-genuine front grille emblem is installed
      • The millimeter wave radar sensor assembly or front grille emblem and its surrounding area are dirty
      • An accessory, such as bull bars, a grille guard, etc., which interferes with millimeter radio waves is installed
      • The front grille emblem or its surrounding area has been painted or has a sticker attached
      • There is foreign matter attached to the front grille emblem or millimeter wave radar sensor assembly

      Cause: 
      1. The millimeter wave radar sensor assembly is dirty or obstructed by foreign matter.
      Pre-Collision System Unavailable X2027 Front Radar Sensor Outside Guaranteed Operating Temperature History of system operation being temporarily suspended due to the millimeter wave radar sensor assembly being excessively hot or cold.
      1. Using the Techstream, check "Millimeter-wave Circuit Temperature Protection" in the Data List for Front Radar Sensor.

        Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      2. If the value of "Millimeter-wave Circuit Temperature Protection" is ON, warm or cool the area around the millimeter wave radar sensor assembly.
      Cause: 
      1. The following millimeter wave radar sensor assembly conditions are met:
        • After being subjected to an extremely cold environment, the area around the millimeter wave radar sensor assembly is -30°C (-22°F) or less.
        • After being subjected to an extremely hot environment, the area around the millimeter wave radar sensor assembly is 70°C (158°F) or more.
      Pre-Collision System Unavailable X2028 Front Radar Sensor Outside Guaranteed Operating Voltage History of system operation being temporarily suspended due to millimeter wave radar sensor assembly power source voltage being excessively high or low.
      1. If this Vehicle Control History code is output, clear the Vehicle Control History (RoB), drive the vehicle at 5 km/h (3 mph) or more and then check if this Vehicle Control History code is output again.
      2. If output again, check if the voltage between terminals IGB and SGND of the millimeter wave radar sensor assembly is within the specified range.

        Refer to TERMINALS OF ECU [05/2019 - ]

      3. Using the Techstream, check "IG Voltage" in the Data List for Front Radar Sensor.

        Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      4. If the value of "IG Voltage" is ON, check if the voltage between terminals IGB and SGND of the millimeter wave radar sensor assembly is within the specified range.

        Refer to TERMINALS OF ECU [05/2019 - ]

      Cause: 
      1. The following millimeter wave radar sensor assembly conditions are met:
        • The input voltage decreases to approximately 8 V or less directly after the hybrid system starts.
        • The input voltage increases to approximately 16 V or more directly after the hybrid system starts.
  2. CLEAR VEHICLE CONTROL HISTORY (FRONT RADAR SENSOR SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Front Radar Sensor / Utility / Vehicle Control History (RoB).

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Vehicle Control History (RoB)
    5. According to the display on the Techstream, clear the Vehicle Control History (RoB).
      NOTE:

      By performing this procedure, all stored Vehicle Control History will be cleared.

  3. CHECK VEHICLE CONTROL HISTORY (AIRBAG SYSTEM) 

    HINT: 

    A part of the control history can be confirmed using the Vehicle Control History.

    Refer to VEHICLE CONTROL HISTORY [05/2019 - ]

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