NAVIGATION SYSTEM AVC-LAN Circuit

DESCRIPTION

Each audio system component connected to the AVC-LAN (communication bus) transfers switch signals using the audio visual communication local area network.

If a short to +B or short to ground occurs in the AVC-LAN, the audio system will not function normally because communication is not possible.

WIRING DIAGRAM

B005A1RE03

CAUTION / NOTICE / HINT

Note

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

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PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. Remove the radio receiver assembly.

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    2. B0057N1N18

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      7 (TX1+) - 8 (TX1-) Always 60 to 80 Ω
      45 (TX3+) - 46 (TX3-) Always 60 to 80 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT)


    • *1: w/ Panoramic View Monitor System

    • *2: w/ Headup Display


    1. Disconnect the I38 radio receiver assembly connector.

    2. Disconnect the I42 multi-display assembly connector.

    3. Disconnect the P19 parking assist ECU connector.*1

    4. Disconnect the J5 combination meter mirror ECU connector.*2

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I38-45 (TX3+) - I42-7 (TX+) Always Below 1 Ω
      I38-46 (TX3-) - I42-19 (TX-) Always Below 1 Ω
      I38-7 (TX1+) - P19-13 (TX+)*1 Always Below 1 Ω
      I38-8 (TX1-) - P19-12 (TX-)*1 Always Below 1 Ω
      I42-6 (TX1+) - J5-12 (MPX1)*2 Always Below 1 Ω
      I42-18 (TX1-) - J5-13 (MPX2)*2 Always Below 1 Ω
      I38-45 (TX3+) - Body ground Always 10 kΩ or higher
      I38-46 (TX3-) - Body ground Always 10 kΩ or higher
      I38-7 (TX1+) - Body ground*1 Always 10 kΩ or higher
      I38-8 (TX1-) - Body ground*1 Always 10 kΩ or higher
      I42-6 (TX1+) - Body ground*2 Always 10 kΩ or higher
      I42-18 (TX1-) - Body ground*2 Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MALFUNCTIONING PARTS


    1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.

      Tech Tips


      • Check all slave units.

      • When disconnecting a slave unit causes the master unit to return to normal operation, this indicates that the slave unit is malfunctioning. Replace the malfunctioning slave unit.

      OK
      Master unit returns to normal operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here