NAVIGATION SYSTEM (for Navigation Receiver 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

A0043HJE16

INSPECTION PROCEDURE

Tech Tips

The navigation ECU sub-assembly is the master unit.

PROCEDURE


  1. INSPECT NAVIGATION ECU SUB-ASSEMBLY


    1. A0040C9E04
      Text in Illustration
      *a

      Component without harness connected

      (Navigation ECU Sub-assembly)

      Disconnect the L27 and L28 navigation ECU sub-assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L27-7 (TX1+) - L27-8 (TX1-) Always 60 to 80 Ω
      L28-3 (TX3+) - L28-4 (TX3-) Always 60 to 80 Ω

    NG

    REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

    OK

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


    1. Disconnect the L27 and L28 navigation ECU sub-assembly connectors.

    2. Disconnect the L69 stereo component amplifier assembly connector.

    3. Disconnect the L60 parking assist ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L69-8 (TX+) - L27-7 (TX1+) Always Below 1 Ω
      L69-7 (TX-) - L27-8 (TX1-) Always Below 1 Ω
      L60-11 (TX+) - L28-3 (TX3+) Always Below 1 Ω
      L60-10 (TX-) - L28-4 (TX3-) Always Below 1 Ω
      L69-8 (TX+) - Body ground Always 10 kΩ or higher
      L69-7 (TX-) - Body ground Always 10 kΩ or higher
      L60-11 (TX+) - Body ground Always 10 kΩ or higher
      L60-10 (TX-) - 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 NAVIGATION ECU SUB-ASSEMBLY Click here

    OK

    REPLACE MALFUNCTIONING PARTS