AVC-LAN Circuit (TO 12/2010): Description
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Each audio system component 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 audio system will not function normally because communication is not possible.