AUDIO AND VISUAL SYSTEM 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

A000RAKE11

PROCEDURE


  1. INSPECT MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A000S1PE25

      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
      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: for 12.3 Inch

    • *2: for 8 Inch

    • *3: w/ Rear Control Switch


    1. Disconnect the N164 multi-media module receiver assembly connector.

    2. Disconnect the N62 accessory meter assembly connector.*1

    3. Disconnect the N155 multi-display connector.*2

    4. Disconnect the Z1 rear control switch connector.*3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N164-45 (TX3+) - N62-7 (TX+)*1 Always Below 1 Ω
      N164-46 (TX3-) - N62-19 (TX-)*1 Always Below 1 Ω
      N164-45 (TX3+) - N155-7 (TX+)*2 Always Below 1 Ω
      N164-46 (TX3-) - N155-19 (TX-)*2 Always Below 1 Ω
      N62-6 (TX1+) - Z1-14 (TX+)*1, *3 Always Below 1 Ω
      N62-18 (TX1-) - Z1-15 (TX-)*1, *3 Always Below 1 Ω
      N155-6 (TX1+) - Z1-14 (TX+)*2, *3 Always Below 1 Ω
      N155-18 (TX1-) - Z1-15 (TX-)*2, *3 Always Below 1 Ω
      N164-45 (TX3+) - Body ground Always 10 kΩ or higher
      N164-46 (TX3-) - Body ground Always 10 kΩ or higher
      N62-6 (TX1+) - Body ground*1, *3 Always 10 kΩ or higher
      N62-18 (TX1-) - Body ground*1, *3 Always 10 kΩ or higher
      N155-6 (TX1+) - Body ground*2, *3 Always 10 kΩ or higher
      N155-18 (TX1-) - Body ground*2, *3 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