Mute Signal Circuit between Disc Player Controller and Multi-display 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.
The multi-display controller controls the volume according to the mute signal from the disc player.
The mute signal is sent to reduce noise and a popping sound generated when switching the mode, etc.
HINT:
Only vehicles with a disc player have this circuit.