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Pattern Select Switch EV Mode Circuit [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. 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/HV AUTO mode switch.

    Result: 

    B 

    END 

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (CAN BUS CHECK) 
    1. Check the 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 [12/2023 - ] 

    Result: 

    A 

    See step  3

  3. 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: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

    Result: 

    A 

    See step  4

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

      Powertrain > Hybrid Control > Data List 

      Tester Display Measurement Item Range Normal Condition
      EVMS Signal Status EV/HV AUTO mode switch signal condition ON or OFF EV/HV AUTO mode switch not operated:
      OFF
      EV/HV AUTO mode switch being pushed and held:
      ON
      EV Mode Status EV mode status Normal / EV Mode / Changing to HV Mode from EV Mode / Changing to EV Mode from HV Mode / EV CITY Mode / Changing to HV Mode from EV CITY Mode / Battery Charge Mode / Changing to HV Mode from Battery Charge Mode / Standby for Battery Charge Mode / EV AUTO Mode / Changing to HV Mode from EV AUTO Mode -

      Powertrain > Hybrid Control > Data List 

      Tester Display
      EVMS Signal Status
      EV Mode Status

      Result

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

    Result: 

    A 

    GO TO PROBLEM SYMPTOMS TABLES. Refer to  PROBLEM SYMPTOMS TABLE [12/2023 - ] 

    Result: 

    B 

    See step  5

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

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE EV/HV AUTO MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY). Refer to  REMOVAL [09/2023 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EV/HV AUTO MODE SWITCH - BODY GROUND) 
    1. Disconnect the EV/HV AUTO mode switch (electric parking brake switch assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D22-7 (E) - Body ground Always Below 1 Ω
    3. Reconnect the EV/HV AUTO mode switch (electric parking brake switch assembly) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - EV/HV AUTO MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)) 
    1. Disconnect the hybrid vehicle control ECU assembly connector.
    2. Disconnect the EV/HV AUTO mode switch (electric parking brake switch assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D117-42 (EVMS) - D22-13 (B) Always Below 1 Ω
      D117-42 (EVMS) or D22-13 (B) - Body ground Always 10 kΩ or higher
    4. Reconnect the the EV/HV AUTO mode switch (electric parking brake switch assembly) connector.
    5. Reconnect the hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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