NAVIGATION SYSTEM (for HDD) > AVC-LAN Circuit

for Preparation Click here


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.

INSPECTION PROCEDURE

NOTICE:
The navigation computer sub-assembly is the master unit.

1.INSPECT NAVIGATION COMPUTER SUB-ASSEMBLY


    E176633E23

  1. Disconnect the H60 navigation computer sub-assembly connector.



    E176636E26

  1. Disconnect the H61 navigation computer sub-assembly connector.



    E176634E15

  1. Disconnect the H63 navigation computer sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H60-13 (TX2+) - H60-14 (TX2-)
    		Always
    		60 to 80 Ω
    H61-1 (TX1+) - H61-2 (TX1-)
    		Always
    		60 to 80 Ω
    H61-12 (TX3+) - H61-13 (TX3-)
    		Always
    		60 to 80 Ω
    H63-9 (TX+) - H63-10 (TX-)
    		Always
    		60 to 80 Ω

Text in Illustration 
*a
Component without harness connected
(Navigation Computer Sub-assembly)


NG
REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY (Click here)
OK


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

HINT:
For details of the connectors, refer to Terminals of ECU (Click here).



  1. Referring to the 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.


      E210255E01

      OK:
      There is no open or short circuit.



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.

    HINT:
    1. Check all slave units.
    2. 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 COMPUTER SUB-ASSEMBLY (Click here)
OK

REPLACE MALFUNCTIONING PARTS