NAVIGATION SYSTEM > AVC-LAN Circuit between Radio Receiver and Gateway ECU

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DESCRIPTION

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


E108030E02


INSPECTION PROCEDURE

1.INSPECT RADIO RECEIVER ASSEMBLY
E108379E02

  1. Disconnect the L56 receiver connector.

  1. Measure the resistance of the receiver.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L56-9 (TX+) - L56-10 (TX-)
    		Always
    		60 to 80 Ω



NG
REPLACE RADIO RECEIVER ASSEMBLY
OK


2.CHECK WIRE HARNESS (RADIO RECEIVER ASSEMBLY - GATEWAY ECU)
E108343E02

  1. Disconnect the L56 receiver connector.

  1. Disconnect the L66 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester connection
    		Condition
    		Specified Condition
    L56-9 (TX+) - L66-6 (GTX+)
    		Always
    		Below 1 Ω
    L56-10 (TX-) - L66-21 (GTX-)
    		Always
    		Below 1 Ω
    L56-9 (TX+) - Body ground
    		Always
    		10 kΩ or higher
    L56-10 (TX-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

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