NAVIGATION SYSTEM (for DVD) 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.

INSPECTION PROCEDURE

Note

The display and navigation module display is the master unit.

PROCEDURE


  1. INSPECT DISPLAY AND NAVIGATION MODULE DISPLAY


    1. A003ZVHE21

      Disconnect the H60 display and navigation module display connector.

    2. A003WO0E24

      Disconnect the H61 display and navigation module display connector.

    3. A003W6EE14

      Disconnect the H63 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
      H60-13 (TX2+) - H60-14 (TX2-) Always 60 to 80 Ω
      H61-1 (TX1+) - H61-2 (TX1-) Always 60 to 80 Ω
      H61-12 (TX3+) - H61-13 (TX3-) Always 60 to 80 Ω
      H63-9 (TX+) - H63-10 (TX-) Always 60 to 80 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Display and Navigation Module Display)


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

    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.

        A003YG2E01
        OK
        There is no open or short circuit.

    NG
    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
    OK