PCM2 control module (head unit)

The PCM2 control module (head unit) includes the following components: 

Internal: 

PCM2 gateway

PCM2 Man Machine Interface (MMI)

Internal amplifier (optional, depending on the equipment)

Tuner

Single CD

Navigation (optional/insertion)

VOCS (voice control system) (optional/insertion)

Controller Area Network (CAN) Comfort

MOST switch

External: 

External amplifier (optional, Harman or BOSE)

CD changer (CDC), (optional)

Telephone/telematics (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 electronically via the MOST. Data is transferred outside of the PCM2 via the optical MOST.