July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Sound Signal Circuit between Multi-display Controller and Disc Player Controller: Description

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

This is the sound signal circuit from the disc player to the multi-display controller.