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 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

A0043HJE15

INSPECTION PROCEDURE

Tech Tips

The radio and display receiver assembly is the master unit.

PROCEDURE


  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Disconnect the z30 and L107 radio and display receiver assembly connectors.

    2. A0042FNE02
      Text in Illustration
      *A for 8 Speakers
      *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
      z30-9 (AVC+) - z30-10 (AVC-) Always 60 to 80 Ω
      L107-7 (TX1+) - L107-8 (TX1-)*1 Always 60 to 80 Ω

      *1: for 8 Speakers


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


    1. Disconnect the z30 and L107 radio and display receiver assembly connectors.

    2. Disconnect the z29 extension module connector.

    3. Disconnect the L69 stereo component amplifier assembly connector (for 8 Speakers).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z30-9 (AVC+) - z29-2 (AVC+) Always Below 1 Ω
      z30-10 (AVC-) - z29-3 (AVC-) Always Below 1 Ω
      L107-7 (TX1+) - L69-8 (TX+)*1 Always Below 1 Ω
      L107-8 (TX1-) - L69-7 (TX-)*1 Always Below 1 Ω
      z30-9 (AVC+) - Body ground Always 10 kΩ or higher
      z30-10 (AVC-) - Body ground Always 10 kΩ or higher
      L107-7 (TX1+) - Body ground*1 Always 10 kΩ or higher
      L107-8 (TX1-) - Body ground*1 Always 10 kΩ or higher

      • *1: for 8 Speakers


    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