NAVIGATION SYSTEM (for Radio and Display Type) AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers 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

A01EJF0E24

INSPECTION PROCEDURE

Tech Tips

The radio and display receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Remove the radio and display receiver assembly.

    2. A01EMJVE04
      Text in Illustration
      *a

      Component without harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V3-9 (AVC+) - V3-10 (AVC-) Always 60 to 80 Ω
      E42-7 (TX1+) - E42-8 (TX1-) Always 60 to 80 Ω

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

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


    1. Disconnect the E42 and V3 radio and display receiver assembly connectors.

    2. Disconnect the V1 extension module connector.

    3. Disconnect the E14 stereo component amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V3-9 (AVC+) - V1-2 (AVC+) Always Below 1 Ω
      V3-10 (AVC-) - V1-3 (AVC-) Always Below 1 Ω
      E42-7 (TX1+) - E14-8 (TX+) Always Below 1 Ω
      E42-8 (TX1-) - E14-7 (TX-) Always Below 1 Ω
      V3-9 (AVC+) - Body ground Always 10 kΩ or higher
      V3-10 (AVC-) - Body ground Always 10 kΩ or higher
      E42-7 (TX1+) - Body ground Always 10 kΩ or higher
      E42-8 (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.

      • 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 RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    REPLACE MALFUNCTIONING PARTS