Mute Signal Circuit between Radio Receiver and Multimedia Interface ECU: Description

The multimedia interface ECU sends a mute signal to the radio receiver assembly.

The radio receiver assembly controls the volume according to the mute signal from the multimedia interface ECU.

The mute signal is sent to reduce noise and popping sounds generated when switching modes.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the radio receiver assembly is functioning, no sound, or only an extremely faint sound, can be heard.