System Overview
Infotainment Control Module (ICM)
System overview
control module
The infotainment control module (ICM) acts as a gateway between the CAN and MOST networks. It also acts as the master control module in the MOST network and checks the other control modules.
The infotainment control module (ICM) consists of a display / printed circuit board. There is also a remote control for the infotainment control module (ICM).
The infotainment control module (ICM) controls functions run on the MOST network via its user interface. The command is transmitted from the infotainment control module (ICM) to the other control modules in the network. These implement the requested functions, for example sound playback, changing sound sources and radio settings.
The infotainment control module (ICM) also controls the Security function on MOST.
For information about the functions controlled by the infotainment control module (ICM) but implemented by other control modules in the MOST network.
The infotainment control module (ICM) is in the center console. The control module is removed from the center console for replacement.
The infotainment control module (ICM) communicates with other control modules via:
- CAN communication
- LIN communication and
- MOST communication.
MOST communication is via a fiber optic communication link.
The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the infotainment control module (ICM) detects a fault.
Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using the diagnostic tool via the data link connector (DLC) in the vehicle.
A simple way to ensure that the infotainment control module (ICM) is powered and grounded is to check that the display is lit when the ignition key is in positions I or II.
Signals
The table below summarizes the input signals to and output signals from the infotainment control module (ICM). The signal types are divided into infrared signals (IR), MOST communication, LIN communication and CAN communication. The illustration below displays the same information with the Volvo component designations.
Design
Display/Printed circuit board
The infotainment control module (ICM) consists of a display and printed circuit board. The display is connected via a cable direct to the printed circuit board.
The display shows information about the function which is active. It also displays information when selecting functions and preferences for the system. The graphic display consists of a field with 128*64 pixels.
The printed circuit board has an input for display and input and outputs for:
- power supply
- ground
- The controller area network (CAN)
- LIN communication and
- the MOST network.
The processor for the infotainment control module (ICM) is on the printed circuit board.
Therefore the printed circuit board contains all the functionality and logic for the infotainment control module (ICM).
The printed circuit board also stores the software for the infotainment control module (ICM).
When replacing the control module reprogramming is required.
The control module can be diagnosed.
Remote control
There is a remote control for the infotainment system. It is used for remote control of the navigation system. The remote control can be used to activate most of the functions that are controlled via the keypads on the climate control module (CCM) and via the buttons on the steering wheel.
The remote control transmits signals via the IR signals to the receiver unit which is located in the grille for the center speaker in the dashboard. The signals then continue via the directly connected cable to the infotainment control module (ICM) which controls the selected function.
Function
Controlling functions
The infotainment control module (ICM) (16/1.2) does not have its own keypad. All user communication with the infotainment control module (ICM) occurs using the keypad on the climate control module (CCM) (3/112). The signals from the keypad unit are transmitted via the controller area network (CAN).
Controlling the functions using the steering wheel buttons
HINT: The C30 does not have a subwoofer module (SUB).
The steering wheel buttons connected to the steering wheel module (SWM) (3/254) can be used to control:
- volume control and CD track / radio selection
- menu selection for traffic information
- volume control for hands-free calls and the menu selection for the phone module (PHM).
The signals from the steering wheel buttons are transmitted to the steering wheel module (SWM) with LIN communication. The steering wheel module (SWM) transmits the signals on to the Infotainment Control Module (ICM) (16/1) using LIN communication. The infotainment control module (ICM) in turn transmits the signals on to the affected control module on the MOST network.
Functions controlled by the infotainment control module (ICM)
For information about the functions controlled by the infotainment control module (ICM) but carried out by other control modules on the MOST network.
Security on MOST
The function Security on MOST prevents unapproved control modules in the infotainment system from being installed in the vehicle. This is to prevent the theft of units.
The function is controlled by the infotainment control module (ICM). The infotainment control module (ICM) checks the serial numbers of all the control modules in the MOST network and compares these with a stored list. The infotainment control module (ICM) retrieves data about the serial number of the control modules via the MOST network. The infotainment control module (ICM) compares the information with the stored serial numbers.
If a control module is not in the stored list, it is disconnected from the MOST network and the functionality of this control module is blocked. This means that control modules in the MOST network cannot be moved from one vehicle to another.
A diagnostic trouble code (DTC) is stored in the infotainment control module (ICM) if a control module in the stored list gives the incorrect response.