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

DESCRIPTION

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

A01EVDOE04

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 Click here.

    2. A01ETUSE33
      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
      I155-7 (TX1+) - I155-8 (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 I155 radio and display receiver assembly connector.

    2. Disconnect the I69 stereo component amplifier assembly connector.

    3. Disconnect the X1 rear control switch connector (w/ Rear Control Switch).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I155-7 (TX1+) - I69-7 (TX+) Always Below 1 Ω
      I155-8 (TX1-) - I69-8 (TX-) Always Below 1 Ω
      I69-20 (TXD+) - X1-15 (TX+)* Always Below 1 Ω
      I69-19 (TXD-) - X1-5 (TX-)* Always Below 1 Ω
      I155-7 (TX1+) - Body ground Always 10 kΩ or higher
      I155-8 (TX1-) - Body ground Always 10 kΩ or higher
      I87-20 (TXD+) - Body ground* Always 10 kΩ or higher
      I87-19 (TXD-) - Body ground* Always 10 kΩ or higher

      • *: w/ Rear Control Switch


    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.

      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.

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

    REPLACE MALFUNCTIONING PARTS