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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System (Int) - Diagnostics & Circuit Tests (2 Of 2) >> Lighting System >> Push Start Switch Illumination Circuit [10/2022 - 11/2023] >> Procedure

Push Start Switch Illumination Circuit [10/2022 - 11/2023]: Procedure

  1. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Smart Key > Active Test 

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

      Body Electrical > Smart Key > Active Test 

      Tester Display
      Power/Engine SW Light

      OK

      Push start 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 [12/2019 - 11/2023] 

    Result: 

    NG 

    See step  2

  2. INSPECT PUSH START SWITCH 

    for A25A-FXS: Refer to INSPECTION [12/2019 - 11/2023]

    for T24A-FTS: Refer to INSPECTION [10/2022 - 11/2023]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE PUSH START SWITCH 

    for A25A-FXS: Refer to REMOVAL [10/2022 - 11/2023]

    for T24A-FTS: Refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (PUSH START SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 
    1. Disconnect the H48 certification ECU (smart key ECU assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (for Gasoline Model)

      Tester Connection Condition Specified Condition
      H49-9 (SWIL) - H48-10 (SWIL) Always Below 1 Ω
      H49-6 (AGND) - H48-11 (AGND) Always Below 1 Ω
      H49-9 (SWIL) or H48-10 (SWIL) - Body ground Always 10 kΩ or higher
      H49-6 (AGND) or H48-11 (AGND) - Body ground Always 10 kΩ or higher

      Standard Resistance (for HV Model)

      Tester Connection Condition Specified Condition
      H50-9 (SWIL) - H48-10 (SWIL) Always Below 1 Ω
      H50-6 (AGND) - H48-11 (AGND) Always Below 1 Ω
      H50-9 (SWIL) or H48-10 (SWIL) - Body ground Always 10 kΩ or higher
      H50-6 (AGND) or H48-11 (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 [12/2019 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR