Circuit Description
WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
Each unit of LEXUS 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, LEXUS navigation system will not function normally as the communication is discontinued
In this AVC-LAN, Navigation ECU becomes the master of the communication, and the audio head unit has a resistance necessary for transmitting the communication.
Multi Display is connected between Navigation ECU and Audio head unit, LEXUS navigation system has the structure that makes communication impossible without navigation ECU, Multi display or audio head unit
AVC-LAN