AM/FM Radio
WARNING: This page is about a different car, the 2014 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
Audio signals are sent via the AM /FM antenna coaxial cable from the roof-mounted antenna to the ACM . The ACM converts the radio waves to a fluctuating AC output voltage and sends the left and right audio signals to the audio DSP module. The audio DSP module processes the audio signals and sends them to the speakers.