Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

PCM2 Control Module (Head Unit)



PCM2 Control Module (Head Unit)

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

Internal:
PCM2 gateway
PCM2 Man Machine Interface (MMI)
Amplifier (internal)
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) Telephone/telematics (optional) CD changer (CDC), (optional)
The PCM2 consists of at least two but a maximum of four MOST nodes, (Gateway, MMI and optional Navigation and VOCS (optional)), which communicate with each other via the electronic MOST. Data is transferred outside of the PCM2 via the optical MOST.

Telephone/telematics
The telephone/telematics feature is available as an option and is linked to the PCM2 via the optical waveguide.

Tuner
The tuner is part of the PCM2 (on the main board).

External amplifier
The external amplifier (Harman or BOSE) is available as an optional feature and is linked to the PCM2 via the optical waveguide.

Internal amplifier
The internal amplifier is part of the PCM2 (installed on the main board).

Wake-up function
All control modules connected to the MOST are in sleep mode if the PCM2 is deactivated. When the PCM2 is switched on, a light is switched on via the MMI. It is reinforced and passed on by the MOST control modules that are connected.