NAVIGATION SYSTEM AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transmits signals via AVC-LAN communication.

If a short to +B or short to ground occurs in an AVC-LAN communication line, the navigation system will not function normally because communication is not possible.

WIRING DIAGRAM


  1. B00708VE22
    *a Cooler Control Switch Assembly
    *b Radio and Display Receiver Assembly
    *c AVC-LAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

The radio and display receiver assembly is the master unit.

Note


  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

    Click here

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:


    • A communication malfunction DTC may be stored.

    • The radio and display receiver assembly may not operate normally.

PROCEDURE


  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Remove the radio and display receiver assembly.

    2. B0070GHC01
      *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
      K3-5 (TX1+) - K3-6 (TX1-) Always 60 to 80 Ω
      Result
      Proceed to
      OK
      NG

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


    1. Disconnect the K3 radio and display receiver assembly connector.

    2. Disconnect the Z1 cooler control switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z1-7 (TX+) - K3-5 (TX1+) Always Below 1 Ω
      Z1-8 (TX-) - K3-6 (TX1-) Always Below 1 Ω
      Z1-7 (TX+) or K3-5 (TX1+) - Body ground Always 10 kΩ or higher
      Z1-8 (TX-) or K3-6 (TX1-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. INSPECT MALFUNCTIONING PARTS


    1. Disconnect and reconnect each slave unit one by one until the master unit returns to normal.

      Tech Tips


      • Check all slave units.

      • If disconnecting a slave unit causes the master unit to return to normal, the slave unit is defective and should be replaced.

      OK
      Master unit returns to normal.
      Result
      Proceed to
      OK
      NG

    OK
    NG