Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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
- The DVD-player for updating map information and software.
The GPS-unit and TMC-receiver are integrated in the Multimedia module (MMM).
The screen is directly connected to the Multimedia module (MMM).
Multimedia module (MMM) has a hard drive where the map information is stored.
The DVD-player is integrated in Multimedia module (MMM) and is used to update map information and software.
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 located in the glove compartment.
For further information, see SIGNALS .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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