Comfort and Convenience
The on-board computer reports values the car already measures, such as consumption and range. It reads conditions back to the driver and changes nothing about how the cabin itself feels.
Safety and Driver Assistance
When wheel speeds show the car turning more or less than the steering angle commands, ESP brakes individual wheels to generate a correcting yaw moment and pull the intended line back.
Multimedia and Connectivity
The audio system handles decoding and amplification: it converts the incoming signal into speaker-level power. Getting a track to it is the job of USB or the AUX audio input.