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Upper control panel control unit, location/task/design/function - GF54.21-P-4105T

Model 211.0/6 

Fig 1: Locating Upper Control Panel Control Unit
G07253693Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Upper control panel control unit, location The upper control panel control unit (N72/1) is located below the audio unit in the central area of the dashboard.  
Upper control panel control unit, task   GF54.21-P-4105-02T 
Upper control panel control unit, design   GF54.21-P-4105-03T 
Upper control panel control unit, function The upper control panel control unit (N72/1) operates with its own dedicated microprocessor which scans switches, actuates appropriate semiconductor switches and exchanges data with the interior CAN.