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

DESCRIPTION

Each audio system component connected to the AVC-LAN (communication bus) transfers switch signals using the audio visual communication local area network.

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

WIRING DIAGRAM

B001W5CE05
*1 Parking Assist ECU
*2 Multi-media Module Receiver Assembly
*3 Multi-display Assembly
*4 AVC-LAN Communication Line

PROCEDURE


  1. INSPECT MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. B001XXJE22

      Remove the multi-media module receiver assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      7 (TX1+) - 8 (TX1-) Always 60 to 80 Ω
      45 (TX3+) - 46 (TX3-) Always 60 to 80 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the F77 multi-media module receiver assembly connector.

    2. Disconnect the F79 multi-display assembly connector.

    3. Disconnect the F75 parking assist ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-45 (TX3+) - F79-7 (TX+) Always Below 1 Ω
      F77-46 (TX3-) - F79-19 (TX-) Always Below 1 Ω
      F77-7 (TX1+) - F75-11 (TX+) Always Below 1 Ω
      F77-8 (TX1-) - F75-10 (TX- ) Always Below 1 Ω
      F77-45 (TX3+) - Body ground Always 10 kΩ or higher
      F77-46 (TX3-) - Body ground Always 10 kΩ or higher
      F77-7 (TX1+) - Body ground Always 10 kΩ or higher
      F77-8 (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.

      • When disconnecting a slave unit causes the master unit to return to normal operation, this indicates that the slave unit is malfunctioning. Replace the malfunctioning slave unit.

      OK
      Master unit returns to normal operation.

    OK

    REPLACE MALFUNCTIONING PARTS

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here