NAVIGATION SYSTEM AVC-LAN Circuit

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.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

   
   

   1. Disconnect the radio and display receiver assembly connectors.

   2. 

      Text in Illustration

      *a	Component without harness connected (Radio and Display Receiver Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition i3-9 (TX+) - i3-10 (TX-) Always 60 to 80 Ω

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

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

   
   

   1. Disconnect the radio and display receiver assembly connector.

   2. Disconnect the extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition i3-9 (TX+) - i1-2 (TX+) Always Below 1 Ω i3-10 (TX-) - i1-3 (TX-) Always Below 1 Ω i3-9 (TX+) - Body ground Always 10 kΩ or higher i3-10 (TX-) - Body ground Always 10 kΩ or higher

   
   

   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.

      Tech Tips

      
      

      • Check all slave units.

      • 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 RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

   REPLACE MALFUNCTIONING PARTS