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

B000TX7E14
*a Switch and Volume Assembly
*b Multi-display
*c Radio Receiver Assembly
*d AVC-LAN Communication Line

CAUTION / NOTICE / HINT

Note

The following malfunctions may occur if a radio receiver assembly from another vehicle is installed to this vehicle. Therefore, when replacing the radio receiver assembly, be sure to replace it with new one.


  • Communication malfunction DTC is output

  • Does not operate normally

Tech Tips

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.

      Click here

    2. B000YX1C02
      *a

      Component without harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (TX1+) - 6 (TX1) 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. Disconnect the P43 radio receiver assembly connector.

    2. Disconnect the P42 multi-display connector.

    3. Disconnect the P86 switch and volume assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P43-5 (TX1+) - P42-7 (TX+) Always Below 1 Ω
      P43-6 (TX1-) - P42-19 (TX-) Always Below 1 Ω
      P42-6 (TX1+) - P86-4 (TX+) Always Below 1 Ω
      P42-18 (TX1-) - P86-8 (TX-) Always Below 1 Ω
      P43-5 (TX1+) - Body ground Always 10 kΩ or higher
      P43-6 (TX1-) - Body ground Always 10 kΩ or higher
      P42-6 (TX1+) - Body ground Always 10 kΩ or higher
      P42-18 (TX1-) - Body ground 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