NAVIGATION SYSTEM 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

B003NJ6E15
*1 Stereo Component Amplifier Assembly
*2 Navigation Receiver Assembly
*3 AVC-LAN Communication Line

CAUTION / NOTICE / HINT

Note

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

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Tech Tips

The navigation receiver assembly is the master unit.

PROCEDURE


  1. INSPECT NAVIGATION RECEIVER ASSEMBLY


    1. B003REPN01

      Remove the navigation 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 NAVIGATION RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the G41 navigation receiver assembly connector.

    2. Disconnect the N56 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
      N56-8 (TX+) - G41-7 (TX1+) Always Below 1 Ω
      N56-7 (TX-) - G41-8 (TX1-) Always Below 1 Ω
      N56-8 (TX+) - Body ground Always 10 kΩ or higher
      N56-7 (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 NAVIGATION RECEIVER ASSEMBLY Click here