Most Network

Fig 1: MOST Network Control Module Locations

Courtesy of VOLVO CARS CORPORATION

The MOST network can consist of up to eight different control modules.

The infotainment control module (ICM) deals with monitoring and communication on the MOST network. The infotainment control module (ICM) is in turn monitored by the central electronic module (CEM) on the CAN network.

When the vehicle is equipped with the Subwoofer module (SUB), the Infotainment control module (ICM) as well as the Audio module (AUD) are also included as standard on the MOST network.

The simplest variation is when the vehicle is only equipped with an Integrated Audio Module (IAM) and an Infotainment control module (ICM).

The table below lists all the control modules which may be included in the MOST network for the C70.

Explanation:

CAN = Controller Area Network, electrical network for communication.

LS CAN = low speed side of the CAN.

MOST = Media Oriented Systems Transport, fiber optic network for communication.

Master control module = Control module which monitors the MOST network.

Slave control module = Control module which supplies the MOST network functions.

Option = Factory installed accessories, during the purchase of a new car.

Accessory = After market installation.

(x) = Position number in the illustration.

Control module	Function	Communication	Other
Infotainment control module (ICM) (1)	Monitors the MOST network.	Master control module, connected to both the LS CAN and the MOST network	Included in the standard set-up of the MOST network. Must be connected to the MOST network to function.
Multimedia module (MMM) (2)	Displays traffic information on the directly connected display screen.	Slave module on the MOST network.	Option, accessory.
Audio module (AUD) (3)	Amplifier to which all loudspeakers except the subwoofer module (SUB) are connected. The microphone is also directly connected to this control module.	Slave module on the MOST network.	Included in the standard set-up of the MOST network when the vehicle is equipped with a Subwoofer module (SUB) or a Global positioning system module (GPS). Otherwise option, accessories.
Subwoofer module (SUB) (4)	There are two bass loudspeakers located behind the rear seat backrest.	Slave module on the MOST network.	Option, accessory. The audio module (AUD) must be connected to the MOST network for the subwoofer module (SUB) to function.
Traffic message channel module (TMC) (5)	Consists of a TMC antenna and a receiver.	Slave module on the MOST network.	Option, accessory.
Global positioning system module (GPS) (6)	Consists of a GPS antenna.	Slave module on the MOST network.	Option, accessory.
Phone module (PHM) (7)	Controls carphone functions.	Connected to the LS CAN and is a slave module on the MOST network.	Option, accessory.
Integrated audio module (IAM) (8)	Available in three versions: CD player, CD changer or combined CD and MD player. Has its own AM/FM aerial. The performance model has 4 loudspeakers. For the High performance and Premium models, the audio module (AUD) is required.	Slave module on the MOST network.	Included in the standard set-up of the MOST network.