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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Hybrid Control System - Diagnostic Codes (7 Of 7) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for THS-HEV Model) >> Brake Override System [10/2022 - ] >> Procedure

Brake Override System [10/2022 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Enter the following menus: System Select / Health Check.
    2. Check for DTCs.

      Result

      Result Proceed to
      No DTCs are output. A
      DTCs are output. B
    3. Turn the ignition switch off.

    Result: 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2024]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

    Result: 

    See step  2

  2. READ VALUE USING GTS (MASTER CYLINDER CONTROL TORQUE) 
    1. Turn the ignition switch to ON (READY).
    2. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Master Cylinder Control Torque

      Standard

      Inspection Condition Specified Condition
      Brake pedal depressed Display changes according to brake pedal depression force

      Result

      Proceed to
      OK
      NG
    3. Turn the ignition switch off.

    Result: 

    NG 

    CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  ON-VEHICLE INSPECTION [10/2022 - 08/2023]  , or refer to  ON-VEHICLE INSPECTION [08/2023 - ] 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING GTS (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE %, ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE %) 
    1. Turn the ignition switch on (IG).
    2. Read the values displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Accelerator Position Sensor No. 1 Voltage %
      Accelerator Position Sensor No. 2 Voltage %

      Standard

      Inspection Condition Specified Condition
      Accelerator pedal released → Depressed Changes continuously

      Result

      Proceed to
      OK
      NG
    3. Turn the ignition switch off.

    Result: 

    NG 

    REPLACE ACCELERATOR PEDAL WITH SENSOR ROD ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING GTS (VEHICLE SPEED) 
    1. Turn the ignition switch to ON (READY).
    2. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Vehicle Speed

      Standard

      Inspection Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at a constant speed
      (16 to 64 km/h (10 to 40 mph))
      No large fluctuations in displayed speed
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

      Result

      Proceed to
      OK
      NG
    3. Turn the ignition switch off.

    Result: 

    NG 

    GO TO METER / GAUGE SYSTEM (SPEED SIGNAL CIRCUIT). Refer to  Speed Signal Circuit [10/2022 - ] 

    Result: 

    OK 

    See step  5

  5. READ VALUE USING GTS (FR, FL, RR, RL WHEEL SPEED) 
    1. Turn the ignition switch on (READY).
    2. Read the values displayed on the GTS.

      Chassis > Brake/EPB > Data List 

      Tester Display
      FR Wheel Speed
      FL Wheel Speed
      RR Wheel Speed
      RL Wheel Speed

      Standard

      Inspection Condition Specified Condition
      Vehicle stopped 0 km/h (0 mph)
      Vehicle being driven at a constant speed
      (16 to 64 km/h (10 to 40 mph))
      No large fluctuations in displayed speed
      WARNING:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      HINT: 

      Data can be captured relatively easily by using the snapshot function in the Data List. Confirm the data after performing the drive test.

      Result

      Proceed to
      OK
      NG
    3. Turn the ignition switch off.

    Result: 

    OK 

    END 

    Result: 

    NG 

    INSPECT FRONT OR REAR SPEED SENSOR. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]