PCM2 control module (head unit): External:

External amplifier (optional, Harman or BOSE)

Telephone/telematics (optional)

CD changer (CDC), (optional)

The PCM2 consists of at least two but a maximum of four MOST nodes, (Gateway, MMI and Navigation and VOCS (optional)), which communicate with each other via the electronic MOST. Data is transferred outside of the PCM2 via the optical MOST.