Freightliner's MMDC Information Display System

The heart of the system is the MMDC module. This module is generally mounted on the floor of the motorhome near the front. If you remove the drawers from the center console you'll see a number of electronics devices located there. The MMDC module is the computer shown to the right. This module will have a pair of wiring connectors that plug into it as well as pressure sensing lines from the two air tanks that supply the coach's air brakes.

The MMDC computer monitors a wide variety of functions and displays the results on the annunciator display at the top center of the dash. In addition to turn signal and high beam indicators, various warning messages will be displayed and there is a unique lit display for up to 24 different announcements.

Should additional information be needed a third module, the Message Center, will display any detailed error messages on the LCD display. This display will also be used to display and navigate any trip computer functions as set up by the RV owner. While this display is very hard to read in bright sunlight an upgraded white background screen is available from Medallion Instruments as an upgrade.