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Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Lighting System (Int) (Except Hybrid) - Diagnostics & Circuit Tests) >> LIGHTING SYSTEM (for Gasoline Model) >> Engine Switch Illumination Circuit [06/2018 - 08/2020] >> Procedure

Engine Switch Illumination Circuit [06/2018 - 08/2020]: Procedure

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Smart Access / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Smart Access > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Power/Engine SW Light Engine switch illumination OFF or ON -

      Body Electrical > Smart Access > Active Test 

      Tester Display
      Power/Engine SW Light

      OK

      Engine switch illumination comes on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - ]  

    Result: 

    NG 

    See step  2

  2. INSPECT ENGINE SWITCH 
    1. Remove the engine switch.

      Refer to REMOVAL [06/2018 - 08/2021]

    2. Inspect the engine switch.

      Refer to INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ENGINE SWITCH. Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. Disconnect the G47 certification ECU (smart key ECU assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G48-9 (SWIL) - G47-10 (SWIL) Always Below 1 Ω
      G48-6 (AGND) - G47-11 (AGND) Always Below 1 Ω
      G48-9 (SWIL) or G47-10 (SWIL) - Body ground Always 10 kΩ or higher
      G48-6 (AGND) or G47-11 (AGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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