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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 >> Interior Light Auto Cut Circuit [11/2023 - ] >> Procedure

Interior Light Auto Cut Circuit [11/2023 - ]: Procedure

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

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Relay for Interior Light Auto Cut Function DOME CUT relay OFF or ON Perform the Active Test with the vehicle stopped and ignition switch ON.
      • OFF: DOME CUT relay on (interior lights turn on)
      • ON: DOME CUT relay off (interior lights turn off)

      Body Electrical > Main Body > Active Test 

      Tester Display
      Relay for Interior Light Auto Cut Function

      OK

      All of the interior lights turn off when ON is selected.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8H power distribution box assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      8H-1 - Body ground Always*1
      Ignition switch off*2      		 11 to 14 V

      *1: for Gasoline Model

      *2: except Gasoline Model

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      8H-1 - 8G-20 Auxiliary battery positive (+) → 8H-1
      Auxiliary battery negative (-) → MB-17 (DOMR)      		 11 to 14 V
      8H-1 - 8C-4 Auxiliary battery positive (+) → 8H-1
      Auxiliary battery negative (-) → MB-17 (DOMR)      		 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      8H-1 - 8G-20 Auxiliary battery not connected to 8H-1 - MB17 10 kΩ or higher
      8H-1 - 8C-4 Auxiliary battery not connected to 8H-1 - MB17 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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