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

Figure 1. for 6 Speakers

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

Figure 2. for 9 Speakers

B006ZB6E32

CAUTION / NOTICE / HINT

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.

Tech Tips

The radio and display receiver assembly is the master unit.

PROCEDURE


  1. CHECK MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for 6 Speakers A
      for 9 Speakers B

    B

    INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    A

  2. 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

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  3. 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. 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

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  5. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. Remove the radio and display receiver assembly.

      Click here

    2. B0070GHC03
      *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

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

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


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

    2. Disconnect the K10 stereo component amplifier assembly connector.

    3. Disconnect the Z1 cooler control switch assembly connector. (w/ Cooler Control Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K3-5 (TX1+) - K10-8 (TX+) Always Below 1 Ω
      K3-6 (TX1-) - K10-7 (TX-) Always Below 1 Ω
      K10-20 (TXD+) - Z1-7 (TX+)* Always Below 1 Ω
      K10-19 (TXD-) - Z1-8 (TX-)* Always Below 1 Ω
      K3-5 (TX1+) or K10-8 (TX+) - Body ground Always 10 kΩ or higher
      K3-6 (TX1-) or K10-7 (TX-) - Body ground Always 10 kΩ or higher
      K10-20 (TXD+) or Z1-7 (TX+) - Body ground* Always 10 kΩ or higher
      K10-19 (TXD-) or Z1-8 (TX-) - Body ground* Always 10 kΩ or higher

      • *: w/ Cooler Control Switch Assembly

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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

    REPLACE MALFUNCTIONING PARTS

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here