NAVIGATION SYSTEM AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals by communication.

When a short to +B or short to ground occurs in this AVC-LAN, the navigation system will not function normally as communication is stopped.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER


    1. A0163DME01

      Disconnect the radio receiver connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      J66-5 (ATX+) -

      J66-15 (ATX-)

      		 Always 60 to 80 Ω

      J63-9 (TX+) -

      J63-10 (TX-)

      		 Always 60 to 80 Ω

    NG

    REPLACE RADIO RECEIVER Click here

    OK

  2. CHECK HARNESS AND CONNECTOR

    Tech Tips

    For details of the connectors, refer to Terminals of ECU Click here.


    1. Referring to AVC-LAN Wiring Diagram below, check all AVC-LAN circuits.


      1. Disconnect all connectors in all AVC-LAN circuits.

      2. Check for an open or short in all AVC-LAN circuits.

        OK
        There are no open or short circuits.
        A0161DBE01

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MALFUNCTIONING PARTS


    1. Disconnect each slave unit one by one to check if the master unit returns to normal operation. If the master unit dose not return to normal operation, reconnect the disconnected slave unit and then check the other slave units.

      OK
      Master unit returns to normal operation.

      Tech Tips


      • Check all slave units.

      • If the master unit returns to normal operation after disconnecting a slave unit, there is a short in the slave unit. Therefore, replace the slave unit.


    NG

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

    REPLACE MALFUNCTIONING PARTS