AUDIO AND VISUAL SYSTEM AVC-LAN Circuit

DESCRIPTION

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.

When a short to +B or short to ground occurs in this AVC-LAN, the audio system will not function normally as the communication is discontinued.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER


    1. Disconnect the radio receiver connectors.

      A015YOTE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J66-5 (ATX+) - J66-15 (ATX-) Always 60 to 80 Ω
      J65-9 (TXM+) - J65-10 (TXM-) Always 60 to 80 Ω
      J63-9 (TX+) - J63-10 (TX-) 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 are no open or short circuits.
        A015YWSE01

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MALFUNCTIONING PARTS


    1. Disconnect each slave unit one by one to check if the master unit returns to normal operation. If the master unit does not return to normal operation, reconnect the disconnected slave unit and then check the other slave units.

      OK
      Master unit returns to normal operation.

      Tech Tips


      • Check all slave units.

      • If the master unit returns to normal operation after disconnecting a slave unit, there is a short in the slave unit. Therefore, replace the slave unit.


    NG

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

    REPLACE MALFUNCTIONING PARTS