Most Network
The MOST network can consist of up to nine 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.
The vehicle is always equipped with an Infotainment control module (ICM) and Integrated Audio Module (IAM).
In addition to these two, one or more control modules is/are connected to the MOST loop to obtain the desired functions in the vehicle.
The table below lists all the control modules which may be included in the MOST network.
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.
| control module | Function | Communication | Other |
| Infotainment control module (ICM) | 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) | Displays traffic information on the directly connected display screen. | Slave module on the MOST network. | Option, accessory. The global positioning system module (GPS) must be connected to the MOST network for the Multimedia module (MMM) to work. |
| Traffic message channel module (TMC) | Consists of a TMC antenna and a receiver. | Slave module on the MOST network. | Option, accessory. Only EU. The Global positioning system module (GPS) and Multimedia module (MMM) must be connected to the MOST network for the Traffic message channel module (TMC) to work. |
| Remote Digital Audio Receiver (RDAR) | Receives and decodes digital radio signals. Has a directly connected antenna. | Slave module on the MOST network. | Option, accessory. Only USA/CDN. |
| Audio module (AUD) | Amplifier to which all speakers except the subwoofer module (SUB) are connected. | Slave module on the MOST network. | Option, accessory. Included in sound systems High Performance and Premium Sound. |
| Subwoofer module (SUB) | Amplifier and bass speakers integrated in the same unit. | Slave module on the MOST network. | Option, accessory. S40/V50/C70 only. The audio module (AUD) must be connected to the MOST network for the subwoofer module (SUB) to function. |
| Global positioning system module (GPS) | Consists of a GPS antenna. | Slave module on the MOST network. | Option, accessory. |
| Phone module (PHM) | Controls carphone functions. | Connected to the LS CAN and is a slave module on the MOST network. | Option, accessory. The audio module (AUD) must be connected to the MOST network for the Phone module (PHM) to function. |
| Integrated Audio Module (IAM) | Has its own AM/FM aerial. The performance model has 4 loudspeakers. For the High performance and Premium Sound models, the audio module (AUD) is required. |
Slave module on the MOST network. | Included in the standard set-up of the MOST network. |