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 TMC receiver are integrated in the multimedia module (MMM). The high level display front (HLDF) is directly connected to the multimedia module (MMM). The DVD player is integrated in the multimedia module (MMM). Other functions come from control modules on the MOST network, but are handled with the help of the multimedia module (MMM). The system cannot handle music CDs or DVDs.
The multimedia module (MMM) communicates with other control modules via the MOST network.
The control module checks 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 with the diagnostic tool 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 simply way of checking that the multimedia module (MMM) is receiving power is to insert and remove a DVD. If this does not work, first check that the unit has voltage and ground.
The multimedia module (MMM) is located in the cargo compartment.
For V70/XC70/XC60 the control module is located on the left side, under the load floor.
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.