AVC-LAN Circuit

NAVIGATION: NAVIGATION SYSTEM: AVC-LAN Circuit

AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers switch signals by the audio visual communication local area network.
If 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 NAVIGATION RECEIVER ASSEMBLY
(a) Disconnect the navigation receiver assembly connectors.




(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR
HINT: For details of the connectors, refer to "TERMINALS OF ECU" Pinout Values and Diagnostic Parameters.
(a) 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.





OK:
There is no open or short circuit.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT MALFUNCTIONING PARTS
(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.
HINT:
- Check all slave units.
- Replace the slave unit that when disconnected, returns the master unit to normal operation.

OK:
Master unit returns to normal operation.
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- REPLACE MALFUNCTIONING PARTS