Microphone Circuit Between Overhead Junction Block and Multi-display: Description
WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
w/o LEXUS Link System:
This circuit sends a microphone signal from the microphone to the multi-display. It also supplies power from the multi-display to the microphone.
w/ LEXUS Link System:
This circuit sends a microphone signal from the microphone to the multi-display through the mayday ECU. It also supplies power from the mayday ECU to the microphone.