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AVC-LAN Circuit [10/2022 - ]: Procedure

  1. DEALER INSTALLED OPTIONAL DEVICES (AVC-LAN COMPATIBLE DEVICES) 
    1. Disconnect the connector of each dealer installed optional device (AVC-LAN compatible device) and check if the malfunction continues.

      Result

      Result Proceed to
      No dealer installed optional devices are installed A
      The malfunction reoccurs
      The system returns to normal B

    Result: 

    B 

    REPLACE THE DEVICE (OR WIRE HARNESS) 

    Result: 

    A 

    See step  2

  2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY 
    1. Remove the radio and display receiver assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (TX1+) - 2 (TX1-) Always 60 to 80 Ω
      GTY1039458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Radio and Display Receiver Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT) 
    1. Disconnect the H108 radio and display receiver assembly connector.
    2. Disconnect the M38 stereo component amplifier assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M38-8 (TX+) - H108-1 (TX1+) Always Below 1 Ω
      M38-7 (TX-) - H108-2 (TX1-) Always Below 1 Ω
      M38-8 (TX+) - Body ground Always 10 kΩ or higher
      M38-7 (TX-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (AVC-LAN VOLTAGE) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      H108-1 (TX1+) - H108-2 (TX1-) Ignition Switch ACC Approximately 0 V
      H108-1 (TX1+) - Body ground Ignition Switch ACC Approximately 2.5 V
      H108-2 (TX1-) - Body ground Ignition Switch ACC Approximately 2.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    CHECK HARNESS OR CONNECTOR 

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