AUDIO AND VISUAL SYSTEM (w/ Multi-display) AVC-LAN Circuit

DESCRIPTION

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

A019MZ2E03

INSPECTION PROCEDURE

Tech Tips

The radio receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. Disconnect the G37, G38 and G40 radio receiver assembly connectors.

    2. A019L8DE05
      A019KGQE01
      A019MZJE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-5 (TX2+) - G37-15 (TX2-) Always 60 to 80 Ω
      G40-1 (TX4+) - G40-2 (TX4-) Always 60 to 80 Ω
      G38-7 (TX1+) - G38-8 (TX1-) Always 60 to 80 Ω
      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 G37, G38 and G40 radio receiver assembly connectors.

    2. Disconnect the O33 stereo component amplifier assembly connector.

    3. Disconnect the G41 multi-display assembly connector.

    4. Disconnect the G44 remote operation board connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-5 (TX2+) - O33-8 (TX+) Always Below 1 Ω
      G37-15 (TX2-) - O33-7 (TX-) Always Below 1 Ω
      G40-1 (TX4+) - G41-7 (TX+) Always Below 1 Ω
      G40-2 (TX4-) - G41-19 (TX-) Always Below 1 Ω
      G38-7 (TX1+) - G44-4 (TX+) Always Below 1 Ω
      G38-8 (TX1-) - G44-8 (TX-) Always Below 1 Ω
      G37-5 (TX2+) - Body ground Always 10 kΩ or higher
      G37-15 (TX2-) - Body ground Always 10 kΩ or higher
      G40-1 (TX4+) - Body ground Always 10 kΩ or higher
      G40-2 (TX4-) - Body ground Always 10 kΩ or higher
      G38-7 (TX1+) - Body ground Always 10 kΩ or higher
      G38-8 (TX1-) - Body ground Always 10 kΩ or higher

    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.

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

    REPLACE MALFUNCTIONING PARTS