Circuit Description
WARNING: This page is about a different car, the 2005 Lexus LX 470. 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 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, multi display becomes the master of the communication, and the radio receiver assembly has a terminator necessary for transmitting the communication.
Multi display is connected between navigation ECU and radio receiver assembly. The navigation system has the structure that makes it impossible to communicate without navigation ECU, multi display or radio receiver assembly.
AVC-LAN