MMI Overview from June 2009

MMI Overview from June 2009

Information Electronics Control Module 1 MMI Overview

The information electronics control module 1 (J794) 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 Not Installed

8 Internal Hard Drive Disc Storage

9 Information Electronics Control Module 1 (J794)

Radio MMI overview

Depending on the equipment level, the radio contain the following known control modules from the 2nd generation:





1 Digital Sound System Control Module (J525)

2 Radio (R)

3 Radio 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

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 soiled.

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.

Additional information, refer to self study program 286, New data bus systems - LIN, MOST Bluetooth.