System Overview

System overview

control module





The multimedia module (MMM) is an optional module. Its most important task is handling the functions for:
- navigation
- TMC
- GPS
- RGB output for the screen
- DVD player
The GPS unit and the TMC receiver are integrated in the Multimedia module (MMM). The monitor is directly connected to the Multimedia module (MMM). The DVD player is integrated in the Multimedia module (MMM). The Multimedia module (MMM) has a hard disk where map information is stored.
Map data that is stored on the hard disc is updated via the DVD player.
Other functions come from the control modules on the MOST network, but are managed using the Multimedia module (MMM). The system cannot handle CDs or DVDs containing music or films.
The multimedia module (MMM) communicates with other control modules via the MOST network.
The control module checks internal components, executed activations and input/output signals via its integrated diagnostics. If the control module detects a fault, a diagnostic trouble code is generated. Any diagnostic trouble codes are stored in the control module memory. The information can be read via the data link connector in the vehicle.
In order to work in the MOST network, the infotainment control module (ICM) checks that the central electronic module (CEM) has the correct serial number for the multimedia module (MMM). If the number is incorrect, the multimedia module (MMM) will not be operable. If a problem arises upon control module replacement, try switching the ignition off/on.
A simple way to check that the Multimedia module (MMM) is supplied with power is to insert and eject a DVD. The check requires the ignition to be in ignition position II. If this does not work, first check that the unit is powered and grounded.
The Multimedia module (MMM) is installed under the left-hand front seat.
For further information, see Signal specification.

Signals
The table below summarizes the input signals to and output signals from the multimedia module (MMM). The signal types are divided into directly connected signals and MOST communication. The illustration below depicts the same information with the Volvo component designations.