General Information
MMI Infotainment System
The MMI Infotainment system is available in the following equipment levels:
MMI Maximum Equipment
• The information electronics control module 1 (J794) in the top of the center console holds the CD player/DVD player/navigation system/cell phone preparation/voice control system/SD memory card reader.
• Internal hard drive disc storage (HD) for storing navigation data and MP3 files.
• Multimedia control head (E380) in lower center console.
• Front information display control head (J685) in center instrument panel.
• The CD changer (R41)/optional external audio source connection (R199) (interface) in the glove compartment.
• External audio source connection (R199) (AUX IN socket) in the center console storage compartment.
• Digital sound system control module (J525) in the luggage compartment (left rear).
• Sound systems: Standard/Bang and Olufsen.
• Radio (R) on the left side of the luggage compartment in the rear is optional with satellite radio (R146).
• Optional multifunction steering wheel.
• Optional Bluetooth hands-free equipment.
The MOST BUS performs the system data exchange in the MMI.
The connection to the other BUS systems in the vehicle are provided by the data bus on board diagnostic interface (J533).
Fault finding is performed via guided fault finding -> Vehicle diagnosis, testing and information system VAS 5051.
Information Electronics Control Module 1 (J794) (MMI) Overview
The information electronics control module 1 is a 3rd generation MMI. Depending on the equipment level, the information electronics control module 1 contains the following known control modules from the 2nd generation:
1 Front Information Display Control Head Control Module (J523)
2 CD Player (R89)
3 Navigation System with CD Drive Control Module (J401)
4 SD Memory Card Reader
5 Speech Input Control Module (J507)
6 Bluetooth Hands-Free Equipment
7 Telephone Transceiver (R36) (cell phone preparation)
8 internal Hard Drive Disc Storage (HD)
9 Information Electronics Control Module 1 (J794)
Radio (R) (MMI) Overview
Depending on the equipment level, the radio (R) contain the following known control modules from the 2nd generation:
1 Digital Sound System Control Module (J525)
2 Radio (R)
3 Radio (R) AM/FM Tuner
4 Satellite Radio (R146)
5 Not Installed
MOST Bus MMI
1 Front Information Display Control Head (J685)
2 Information Electronics Control Module 1 (J794)
3 MOST Bus
4 CD Changer (R41)
5 Not Installed
6 Radio (R)
7 Digital Sound System Control Module (J525)
8 Data Bus On Board Diagnostic Interface (J533)
9 Multimedia Control Head (E380)
Notes on MOST Bus
In addition to the CAN bus systems, the optical data bus system "MOST bus" is used.
A fiber optic cable is utilized as the connecting cable. Fiber optic cables are routed inside corrugated tubes for protection.
Replace complete fiber optic cable if possible.
Make sure that the face surfaces of the connectors do not become contaminated.
If the connectors are disconnected: Attach protective cap for cable connector (VAS 6223/9).
Observe the minimum bending radius of 25 mm when routing fiber optic cables. Fiber optic cables must not be pinched or bent.
Repairing fiber optic cables.