Microphone Circuit between Overhead Junction Block 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.
This circuit sends a microphone signal from the telephone microphone amplifier (overhead junction block) to the multi-display. It also supplies power from the multi-display to the telephone microphone amplifier.