AVC-LAN Circuit: Description
WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Each unit of navigation system connected with AVC-LAN (communication bus) transfers the signal of each switch.
When +B short and GND short occur in the AVC-LAN, the navigation system will not function normally as the communication is discontinued.
In the AVC-LAN, the multi-display becomes the master of the communication, and the radio receiver assembly has a terminator necessary for transmitting the communication.
The multi-display is connected between the navigation ECU and radio receiver assembly. The navigation system has a structure that makes communication impossible without the navigation ECU, multi-display or radio receiver assembly.