NAVIGATION SYSTEM AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers switch signals using the AVC-LAN.

If a short to +B or short to ground occurs in this 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. 

      Remove the radio and display receiver assembly Click here.

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

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

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - EXTENSION MODULE)

   
   

   1. Disconnect the z24 radio and display receiver assembly connector.

   2. Disconnect the z23 extension module connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition z24-9 (TX+) - z23-2 (TX+) Always Below 1 Ω z24-10 (TX-) - z23-3 (TX-) Always Below 1 Ω z24-9 (TX+) - Body ground Always 10 kΩ or higher z24-10 (TX-) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT EXTENSION MODULE

   
   

   1. Disconnect and reconnect the extension module until the radio and display receiver assembly returns to normal operation.

      OK
      Radio and display receiver assembly returns to normal operation.

      Tech Tips

      If disconnecting a extension module causes the radio and display receiver assembly to return to normal operation, the extension module is defective and should be replaced.

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

   REPLACE EXTENSION MODULE Click here