Component Tests and General Diagnostics

CIRCUIT DESCRIPTION




Each unit of navigation system connected with AVC-LAN (communication bus) transfers the signal of each switch by communication.

When +B short and GND short occur in this AVC-LAN, navigation system will not function normally as the communication is discontinued.

In this AVC-LAN, Navigation ECU becomes the master of the communication, and the Audio head unit has a resistance necessary for transmitting the communication.

Multi-Display is connected between Navigation ECU and Audio head unit, navigation system has the structure that makes communication impossible without Navigation ECU, Multi-Display or Audio head unit.

Wiring Diagram Part 1:

Wiring Diagram Part 2:

Step 1 - 3:

Step 4 - 5:

Step 6:

INSPECTION PROCEDURE