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.
Multimedia Module (Mmm) (2003-2006): Function: Navigation
The navigation function displays the location of the car and directions to the entered destination.
The navigation buttons on the steering wheel module (SWM) (3/130) are used to control the on-screen menu for navigation.
The multimedia module (MMM) (16/108) receives GPS signals from the antenna module (ATM) (16/110) via the MOST network.
Two signals are transmitted via the high speed side of the Controller area network (CAN) to the central electronic module (CEM) (4/56):
- information about the wheel rotation counter is transmitted from the brake control module (BCM) (4/16)
- information about the back-up gear position is transmitted from the transmission control module (TCM) (4/28).
The central electronic module (CEM) transmits both signals to the infotainment control module (ICM) (16/1) via the low speed side of the Controller area network (CAN). The vehicle speed is also transmitted to the infotainment control module (ICM) from the central electronic module (CEM). This in turn sends the signals on to the multimedia module (MMM) on the MOST network.
Information for voice guiding for the selected destination is transmitted on the MOST network between the multimedia module (MMM) and the audio module (AUD) (16/105).
A DVD with the required road network must be installed in order for the multimedia module (MMM) to select a route and display the position of the car. The multimedia module (MMM) is then able to calculate the position and display it on the directly connected screen (16/46).
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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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