AUDIO AND VISUAL SYSTEM(w/o Parking Assist Monitor System) AVC-LAN Circuit

DESCRIPTION

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

A0020Z8E03

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. A0021SMC01
      *a

      Component without harness connected

      (Radio Receiver Assembly)
      A002254C04
      *a

      Component without harness connected

      (Radio Receiver Assembly)
      A0020JAC01
      *a

      Component without harness connected

      (Radio Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K73-18 (TX2+) - K73-19 (TX2-) Always 60 to 80 Ω
      K72-7 (TX1+) - K72-8 (TX1-) Always 60 to 80 Ω
      K74-11 (TX4+) - K74-12 (TX4-) Always 60 to 80 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the K72, K73 and K74 radio receiver assembly connectors.

    2. Disconnect the P24 stereo component amplifier assembly connector.

    3. Disconnect the K61 multi-display assembly connector.

    4. Disconnect the K79 remote operation board connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K72-7 (TX1+) - P24-8 (TX+) Always Below 1 Ω
      K72-8 (TX1-) - P24-7 (TX-) Always Below 1 Ω
      K74-11 (TX4+) - K61-7 (TX+) Always Below 1 Ω
      K74-12 (TX4-) - K61-19 (TX-) Always Below 1 Ω
      K73-18 (TX2+) - K79-10 (TX+) Always Below 1 Ω
      K73-19 (TX2-) - K79-11 (TX-) Always Below 1 Ω
      K72-7 (TX1+) - Body ground Always 10 kΩ or higher
      K72-8 (TX1-) - Body ground Always 10 kΩ or higher
      K74-11 (TX4+) - Body ground Always 10 kΩ or higher
      K74-12 (TX4-) - Body ground Always 10 kΩ or higher
      K73-18 (TX2+) - Body ground Always 10 kΩ or higher
      K73-19 (TX2-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here