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Pattern Select Switch EV Mode Circuit [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. ASK ABOUT VEHICLE CONDITION 
    1. Check if a buzzer sounded and a message was displayed on the multi-information display when attempting to enter EV mode.

      Result

      Result Proceed to
      No buzzer sounded and no message was displayed on multi-information display. A
      A buzzer sounded and a message was displayed on multi-information display. B

      HINT: 

      If a buzzer sounds or a message is displayed on the multi-information display, one or more of the EV mode entry conditions have not been met. Check that all of the EV mode entry conditions have been met before pressing the EV mode switch.

    Result: 

    B 

    END 

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (CAN BUS CHECK) 
    1. Enter the following menus: System Select / CAN Bus Check.

      CAN Bus Check 

      Result

      Result Proceed to
      All of the ECUs and sensors that are currently connected to the CAN communication system are displayed. A
      None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed. B
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 08/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2023 - ] 

    Result: 

    A 

    See step  3

  3. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Enter the following menus: System Select / Health Check.

      Result

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

    Result: 

    B 

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

    Result: 

    A 

    See step  4

  4. READ VALUE USING GTS (EV MODE, EV MODE SWITCH) 
    1. Read the value displayed on the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      EV Mode
      EV Mode Switch

      Powertrain > Hybrid Control > Data List 

      Tester Display Measurement Item Range Normal Condition
      EV Mode EV mode transition availability ON or OFF In EV mode:
      ON
      EV Mode Switch EV mode switch (integration control and panel assembly) condition ON or OFF EV mode switch (integration control and panel assembly) being pushed and held:
      ON
      EV mode switch (integration control and panel assembly) not operated:
      OFF

      Result

      Result Proceed to
      The display changes according to the EV mode switch operation. A
      The display does not change according to the EV mode switch operation. B
    2. Turn the ignition switch off.

    Result: 

    A 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2022 - ] 

    Result: 

    B 

    See step  5

  5. INSPECT EV MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) 

    Refer to INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE EV MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY). Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EV MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) - BODY GROUND) 
    1. Disconnect the EV mode switch (integration control and panel assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C29-7 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG
    3. Reconnect the EV mode switch (integration control and panel assembly) connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - EV MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)) 
    1. Disconnect the hybrid vehicle control ECU connector.
    2. Disconnect the EV mode switch (integration control and panel assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C59-33 (EVSW) - C29-6 (S) Always Below 1 Ω
      C59-33 (EVSW) or C29-6 (S) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG
    4. Reconnect the EV mode switch (integration control and panel assembly) connector.
    5. Reconnect the hybrid vehicle control ECU connector.

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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