NAVIGATION SYSTEM > AVC-LAN Circuit between Radio Receiver and AMP

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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


E107521E03


INSPECTION PROCEDURE

1.INSPECT RADIO RECEIVER ASSEMBLY
E108378E03

  1. Disconnect the L54 receiver connector.

  1. Measure the resistance of the receiver.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L54-5 (ATX+) - L54-15 (ATX-)
    		Always
    		60 to 80 Ω



NG
REPLACE RADIO RECEIVER ASSEMBLY
OK


2.CHECK WIRE HARNESS (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER)
E108347E03

  1. Disconnect the L54 receiver connector.

  1. Disconnect the V29 amplifier connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L54-5 (ATX+) - V29-8 (TX+)
    		Always
    		Below 1 Ω
    L54-15 (ATX-) - V29-7 (TX-)
    		Always
    		Below 1 Ω
    L54-5 (ATX+) - Body ground
    		Always
    		10 kΩ or higher
    L54-15 (ATX-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

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