AUDIO AND VISUAL SYSTEM(for 8 Speakers) 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

A01HH05E02

CAUTION / NOTICE / HINT

Tech Tips

For the AVC-LAN communication line, the radio receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. Remove the radio receiver assembly.

      Click here

      A01HF8AC02
      *A w/ Stereo Component Amplifier *B w/ Panoramic View Monitor System

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      7 (TX1+) - 8 (TX1-)*1 Always 60 to 80 Ω
      7 (TX3+) - 8 (TX3-)*2 Always 60 to 80 Ω
      18 (TX2+) - 19 (TX2-) Always 60 to 80 Ω
      11 (TX4+) - 12 (TX4-) Always 60 to 80 Ω
      *1: w/ Stereo Component Amplifier
      *2: w/ Panoramic View Monitor System
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

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


    • *1: w/ Stereo Component Amplifier

    • *2: w/ Panoramic View Monitor System

    • *3: w/ Headup Display


    1. Disconnect the I121, I122 and I123 radio receiver assembly connectors.

    2. Disconnect the P33 stereo component amplifier assembly connector*1.

    3. Disconnect the I42 multi-display assembly connector.

    4. Disconnect the I132 remote operation controller assembly connector.

    5. Disconnect the P19 parking assist ECU connector*2.

    6. Disconnect the J5 combination meter mirror ECUconnector*3.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I121-7 (TX1+) - P33-8 (TX+)*1 Always Below 1 Ω
      I121-8 (TX1-) - P33-7 (TX-)*1 Always Below 1 Ω
      I123-11 (TX4+) - I42-7 (TX+) Always Below 1 Ω
      I123-12 (TX4-) - I42-19 (TX-) Always Below 1 Ω
      I122-7 (TX3+) - P19-13 (TX+)*2 Always Below 1 Ω
      I122-8 (TX3-) - P19-12 (TX-)*2 Always Below 1 Ω
      I122-18 (TX2+) - I132-10 (TX+) Always Below 1 Ω
      I122-19 (TX2-) - I132-11 (TX-) Always Below 1 Ω
      J5-12 (MPX1) - I42-6 (TX1+)*3 Always Below 1 Ω
      J5-13 (MPX2) - I42-18 (TX1-)*3 Always Below 1 Ω
      I121-7 (TX1+) or P33-8 (TX+) - Body ground*1 Always 10 kΩ or higher
      I121-8 (TX1-) or P33-7 (TX-) - Body ground*1 Always 10 kΩ or higher
      I123-11 (TX4+) or I42-7 (TX+) - Body ground Always 10 kΩ or higher
      I123-12 (TX4-) or I42-19 (TX-) - Body ground Always 10 kΩ or higher
      I122-7 (TX3+) or P19-13 (TX+) - Body ground*2 Always 10 kΩ or higher
      I122-8 (TX3-) or P19-12 (TX-) - Body ground*2 Always 10 kΩ or higher
      I122-18 (TX2+) or I132-10 (TX+) - Body ground Always 10 kΩ or higher
      I122-19 (TX2-) or I132-11 (TX-) - Body ground Always 10 kΩ or higher
      J5-12 (MPX1) - I42-6 (TX1+) - Body ground*3 Always 10 kΩ or higher
      J5-13 (MPX2) - I42-18 (TX1-) - Body ground*3 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