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Home >> Lexus >> 2018 >> LS 500h RWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (W/O Advanced Park) - Diagnostic Codes (10 Of 10) & Circuit Tests (1 Of 2) >> HYBRID CONTROL SYSTEM (w/o Advanced Park) >> Pattern Select Switch EV Mode Circuit [10/2017 - 10/2020] >> Procedure

Pattern Select Switch EV Mode Circuit [10/2017 - 10/2020]: Procedure

  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 and 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 (integration control & panel assembly).

    Result: 

    B 

    END 

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (CAN BUS CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. 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
    5. Turn the power switch off.

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] 

    Result: 

    A 

    See step  3

  3. CHECK DTC OUTPUT (HEALTH CHECK) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.

      Result

      Result Proceed to
      No DTCs are output. A
      DTCs are output. B
    6. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 09/2019]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 10/2020] 

    Result: 

    A 

    See step  4

  4. READ VALUE USING TECHSTREAM (EV MODE, EV MODE SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / EV Mode, EV Mode Switch.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      EV Mode
      EV Mode Switch
    5. Read the value displayed on the Techstream.

      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 & panel assembly) condition ON or OFF EV mode switch (integration control & panel assembly) not pushed: OFF
      EV mode switch (integration control & panel assembly) being pushed and held: ON

      Result

      Result Proceed to
      The display changes according to the EV mode switch (integration control & panel assembly) operation. A
      The display does not change according to the EV mode switch (integration control & panel assembly) operation. B
    6. Turn the power switch off.

    Result: 

    A 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2017 - 10/2023] 

    Result: 

    B 

    See step  5

  5. INSPECT EV MODE SWITCH (INTEGRATION CONTROL & PANEL ASSEMBLY) 
    1. Inspect the EV mode switch (integration control & panel assembly).

      Refer to INSPECTION [10/2017 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE EV MODE SWITCH (INTEGRATION CONTROL & PANEL ASSEMBLY). Refer to  REMOVAL [10/2017 - 10/2022] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EV MODE SWITCH (INTEGRATION CONTROL & PANEL ASSEMBLY) - BODY GROUND) 
    1. Disconnect the G72 EV mode switch (integration control & panel assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY834962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to EV Mode Switch (Integration Control & Panel Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G72-8 (E) - Body ground Power switch off Below 1 Ω
    3. Reconnect the G72 EV mode switch (integration control & panel 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 MODE SWITCH (INTEGRATION CONTROL & PANEL ASSEMBLY)) 
    1. Disconnect the G93 hybrid vehicle control ECU assembly connector.
    2. Disconnect the G72 EV mode switch (integration control & panel assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY833904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)
      *b Front view of wire harness connector
      (to EV Mode Switch (Integration Control & Panel Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      G93-15 (EVSW) - G72-2 (S) Power switch off Below 1 Ω
      G93-15 (EVSW) or G72-2 (S) - Body ground Power switch off 10 kΩ or higher
    4. Reconnect the G72 EV mode switch (integration control & panel assembly) connector.
    5. Reconnect the G93 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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