AUDIO AND VISUAL SYSTEM(except 8 Speakers) AVC-LAN Circuit

DESCRIPTION

Each unit of the audio and visual system connected to the AVC-LAN (communication bus) transmits switch signals via AVC-LAN communication.

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

WIRING DIAGRAM

A0007CSE25
*a Radio Receiver Assembly
*b Rear Control Switch
*c Multi-display Assembly
*d AVC-LAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

The radio receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. Remove the radio receiver assembly.

      Click here

    2. A0004IIC05
      *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
      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. Disconnect the H97 radio receiver assembly connector.

    2. Disconnect the H93 multi-display assembly connector.

    3. Disconnect the j2 rear control switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-45 (TX3+) - H93-7 (TX+) Always Below 1 Ω
      H97-46 (TX3-) - H93-19 (TX-) Always Below 1 Ω
      j2-15 (TX+) - H93-6 (TX1+) Always Below 1 Ω
      j2-5 (TX-) - H93-18 (TX1-) Always Below 1 Ω
      H93-7 (TX+) or H97-45 (TX3+) - Body ground Always 10 kΩ or higher
      H93-19 (TX-) or H97-46 (TX3-) - Body ground Always 10 kΩ or higher
      H93-6 (TX1+) or j2-15 (TX+) - Body ground Always 10 kΩ or higher
      H93-18 (TX1-) or j2-5 (TX-) - 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.

      Tech Tips


      • Check all slave units.

      • If disconnecting a slave unit causes the master unit to return to normal, the slave unit is defective and should be replaced.

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

    OK

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here