Circuit Description
WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
Each unit of the navigation system connected to AVC-LAN (communication bus) communicates by transferring the signals from each switch.
When +B short and GND short occur in this AVC-LAN, navigation system will not function normally as communication is discontinued.
In AVC-LAN, multi-display becomes the communication master, and the radio receiver assy has enough resistance necessary for transmitting the communication.