NAVIGATION SYSTEM(for Radio and Display Type) AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation 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 navigation system will not function normally because communication is not possible.

WIRING DIAGRAM

A01QPNBE07
*1 Stereo Component Amplifier Assembly
*2 Radio and Display Receiver Assembly
*3 AVC-LAN communication Line

CAUTION / NOTICE / HINT

Tech Tips

The radio and display receiver assembly is the master unit.

Note

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

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PROCEDURE


  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01QQN7N01

      Remove the radio and display receiver assembly with the connector(s) still connected.

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    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
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the G143 radio and display receiver assembly connector.

    2. Disconnect the M32 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M32-8 (TX+) - G143-7 (TX1+) Always Below 1 Ω
      M32-7 (TX-) - G143-8 (TX1-) Always Below 1 Ω
      M32-8 (TX+) - Body ground Always 10 kΩ or higher
      M32-7 (TX-) - 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 AND DISPLAY RECEIVER ASSEMBLY Click here