CARPHONE Mute Input Signal
The value indicates the status of the input on the control module for carphone accessories.
Low = The carphone mute function is active, i. e. the connected carphone is receiving a call and is transmitting a low signal. The accessory electronic module (AEM) then transmits a request to lower the sound level to 0 (mute) via the CAN network to the infotainment control module (ICM).
High = The carphone mute function is not active.