AVC-LAN Circuit between Radio Receiver and Multi-Display: Description
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
The navigation system uses the AVC-LAN to control communication between all of its units. Each unit is connected to the AVC-LAN and communicates by sending and receiving switch signals.
When the AVC-LAN has a +B short or a GND short, communication is cut and the navigation system will not function normally.