Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Vehicle Control History

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Front Radar Sensor System / Vehicle Control History

VEHICLE CONTROL HISTORY

NOTICE:

Make sure to record any output Vehicle Control History codes before clearing them and checking the Vehicle Control History again.

CHECK VEHICLE CONTROL HISTORY (FRONT RADAR SENSOR SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) 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)

(e) Read the Vehicle Control History (RoB) according to the display on the Techstream.

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.

-

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.

-

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:
  • 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.

  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:
  • 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.

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

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

Cause:
  • The following millimeter wave radar sensor assembly conditions are met:
    • The input voltage decreases to approximately 8 V or less directly after the engine is started.
    • The input voltage decreases to approximately 16 V or more directly after the engine is started.

CLEAR VEHICLE CONTROL HISTORY (FRONT RADAR SENSOR SYSTEM)

NOTICE:

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) 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)

(e) According to the display on the Techstream, clear the Vehicle Control History (RoB).

CHECK VEHICLE CONTROL HISTORY (AIRBAG SYSTEM)

(a) Part of the control history can be confirmed using the Vehicle Control History.

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    Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Front Radar Sensor System DTC No. Detection Item Link C1A1100 Front Radar Sensor Optical Axis Misalignment Malfunction C1A8C46 Main Microcomputer ...

    Front Radar Sensor Optical Axis Misalignment Malfunction (C1A1100)
    DESCRIPTION The millimeter wave radar sensor assembly performs self-diagnosis to check for misalignment of its beam axis. If misalignment is detected, the millimeter wave radar sensor assembly stores ...

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