Each unit of the navigation system connected to the AVC-LAN (communication bus) communicates by transferring the signals from each switch. When +B and GND shorts occur in this AVC-LAN, the navigation system will not function normally as communication is discontinued. In the AVC-LAN, the multi-display becomes the communication master, and the radio receiver assembly has enough resistance necessary for transmitting the communication.
WIRING DIAGRAM
INSPECTION PROCEDURE
1.REPLACE NAVIGATION ECU
Replace the navigation ECU with a normal one and check if the same problem occurs again.
OK:
Same problem does not occur.
NG
REPLACE MULTI-DISPLAY
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART
