NAVIGATION SYSTEM (for DVD) AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers switch signals by the audio visual communication local area network.

If a short to +B or short to ground occurs in this AVC-LAN, the navigation system will not function normally as communication is stopped.

INSPECTION PROCEDURE

Note

The display and navigation module display is the master unit.

PROCEDURE


  1. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY


    1. A01NCZFE01

      Disconnect the display and navigation module display connector.

    2. A01NH5PE03

      Disconnect the display and navigation module display connector.

    3. A01NHR7E03

      Disconnect the display and navigation module display connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G4-13 (TX+) - G4-14 (TX-) Always 60 to 80 Ω
      G5-1 (TX1+) - G5-2 (TX1-) Always 60 to 80 Ω
      G5-12 (TX2+) - G5-13 (TX2-) Always 60 to 80 Ω
      G24-9 (TXM+) - G24-13 (TXM-) Always 60 to 80 Ω
      Text in Illustration
      *1

      Component without harness connected

      (Display and Navigation Module Display)
      *2

      Component without harness connected

      (Display and Navigation Module Display)
      *3

      Component without harness connected

      (Display and Navigation Module Display)

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR

    Tech Tips

    For details of the connectors, refer to Terminals of ECU Click here.


    1. Referring to the AVC-LAN wiring diagram below, check all AVC-LAN circuits.


      1. Disconnect all connectors in all AVC-LAN circuits.

      2. Check for an open or short in all AVC-LAN circuits.

        A01NGDSE03
        OK
        There is no open or short circuit.

    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.

    NG

    REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Click here

    OK

    REPLACE MALFUNCTIONING PARTS