AUDIO AND VISUAL SYSTEM(for Radio and Display Type) AVC-LAN Circuit

DESCRIPTION

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

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

WIRING DIAGRAM

A004ZB3E20

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. A004X2PE03
      A004WNBE03
      A004YH9E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H165-18 (TX2+) - H165-19 (TX2-) Always 60 to 80 Ω
      H164-7 (TX1+) - H164-8 (TX1-)*1 Always 60 to 80 Ω
      H166-11 (TX4+) - H166-12 (TX4-) Always 60 to 80 Ω

      • *1: for 10 Speakers

      Text in Illustration
      *a

      Component without harness connected

      (Radio Receiver Assembly)

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the H164*1, H165 and H166 radio receiver assembly connectors.


      • *1: for 10 Speakers

    2. Disconnect the H168 stereo component amplifier assembly connector (for 10 Speakers).

    3. Disconnect the H160 multi-display assembly connector.

    4. Disconnect the H161 remote operation board connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H164-7 (TX1+) - H168-8 (TX+)*1 Always Below 1 Ω
      H164-8 (TX1-) - H168-7 (TX-)*1 Always Below 1 Ω
      H166-11 (TX4+) - H160-7 (TX+) Always Below 1 Ω
      H166-12 (TX4-) - H160-19 (TX-) Always Below 1 Ω
      H165-18 (TX2+) - H161-10 (TX+) Always Below 1 Ω
      H165-19 (TX2-) - H161-11 (TX-) Always Below 1 Ω
      H164-7 (TX1+) - Body ground*1 Always 10 kΩ or higher
      H164-8 (TX1-) - Body ground*1 Always 10 kΩ or higher
      H166-11 (TX4+) - Body ground Always 10 kΩ or higher
      H166-12 (TX4-) - Body ground Always 10 kΩ or higher
      H165-18 (TX2+) - Body ground Always 10 kΩ or higher
      H165-19 (TX2-) - Body ground Always 10 kΩ or higher

      • *1: for 10 Speakers


    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.

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

      OK
      Master unit returns to normal operation.

    OK

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here