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 this AVC-LAN, the navigation system will not function normally because communication is not possible.

WIRING DIAGRAM

A01V1TSE09
*a Extension Module
*b Radio and Display Receiver Assembly

CAUTION / NOTICE / HINT

Tech Tips

The radio and display receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01V1F9E01
      Text in Illustration
      *a

      Component without harness connected

      (Radio and Display Receiver Assembly)

      Disconnect the radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V2-9 (TX+) - V2-10 (TX-) Always 60 to 80 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)


    1. Disconnect the V2 radio and display receiver assembly connector.

    2. Disconnect the V1 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V2-9 (TX+) - V1-2 (TX+) Always Below 1 Ω
      V2-10 (TX-) - V1-3 (TX-) Always Below 1 Ω
      V2-9 (TX+) - Body ground Always 10 kΩ or higher
      V2-10 (TX-) - 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.

      OK
      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

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here