NAVIGATION SYSTEM (for Built-in Memory) AVC-LAN Circuit

DESCRIPTION

Each navigation 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

A01DR9DE01

INSPECTION PROCEDURE

Tech Tips

The navigation receiver assembly is the master unit.

PROCEDURE


  1. INSPECT NAVIGATION RECEIVER ASSEMBLY


    1. A01DO9RE04
      Text in Illustration
      *a

      Component without harness connected

      (Navigation Receiver Assembly)

      Remove the navigation 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

    NG

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the h61 navigation receiver assembly connector.

    2. Disconnect the H63 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
      H56-7 (TX1+) - H63-8 (TX+) Always Below 1 Ω
      H56-8 (TX1-) - H63-7 (TX-) Always Below 1 Ω
      H56-7 (TX1+) - Body ground Always 10 kΩ or higher
      H56-8 (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.

    NG

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

    OK

    REPLACE MALFUNCTIONING PARTS