AUDIO AND VISUAL 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.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER


    1. A017C4FE20
      Text in Illustration
      *a

      Component without harness connected

      (Radio Receiver)

      Disconnect the radio receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E24-9 (TXM+) - E24-10 (TXM-) Always 60 to 80 Ω

    NG

    REPLACE RADIO RECEIVER Click here

    OK

  2. CHECK HARNESS AND CONNECTOR

    Tech Tips

    For details of the connectors, refer to Terminals of ECU Click here.


    1. Referring to the following AVC-LAN wiring diagram, check all AVC-LAN circuits.


      1. Disconnect all connectors in all AVC-LAN circuits.

      2. Check for an open or short in all AVC-LAN circuits.

        OK
        There is no open or short circuit.
        A017C7AE13

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MALFUNCTIONING PARTS


    1. Disconnect the slave unit and check if the master unit returns to normal operation.

      Tech Tips

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

      OK
      Master unit returns to normal operation.

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

    REPLACE MALFUNCTIONING PARTS