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

A01NL1DE04

INSPECTION PROCEDURE

Tech Tips

The radio receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. Disconnect the G36, G37 and G39 radio receiver assembly connectors.

    2. A01NKAKE07
      A01NIT8E03
      A01NITOE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G36-5 (TX2+) - G36-15 (TX2-) Always 60 to 80 Ω
      G39-1 (TX4+) - G39-2 (TX4-) Always 60 to 80 Ω
      G37-7 (TX1+) - G37-8 (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 G36, G37 and G39 radio receiver assembly connectors.

    2. Disconnect the O33 stereo component amplifier assembly connector.

    3. Disconnect the G40 multi-display assembly connector.

    4. Disconnect the G43 remote operation board connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G36-5 (TX2+) - O33-8 (TX+) Always Below 1 Ω
      G36-15 (TX2-) - O33-7 (TX-) Always Below 1 Ω
      G39-1 (TX4+) - G40-7 (TX+) Always Below 1 Ω
      G39-2 (TX4-) - G40-19 (TX-) Always Below 1 Ω
      G37-7 (TX1+) - G43-4 (TX+) Always Below 1 Ω
      G37-8 (TX1-) - G43-8 (TX-) Always Below 1 Ω
      G36-5 (TX2+) - Body ground Always 10 kΩ or higher
      G36-15 (TX2-) - Body ground Always 10 kΩ or higher
      G39-1 (TX4+) - Body ground Always 10 kΩ or higher
      G39-2 (TX4-) - Body ground Always 10 kΩ or higher
      G37-7 (TX1+) - Body ground Always 10 kΩ or higher
      G37-8 (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