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Electronic ignition switch control unit, location/task/design/function - GF80.57-P-4102PP: Notes

MODEL 203.0/ 2/ 7, 209 

Shown on model 203.0 up to 23.4.04 

Fig 1: Identifying EIS Control Unit
G04735422Courtesy of MERCEDES-BENZ USA
  Electronic ignition switch control unit, location The EIS control module (N73) is located on the right, next to the steering wheel below the instrument cluster (A1).  
  Electronic ignition switch control unit, purpose Model 203.0/2/7 up to 23.4.04, Model 209 GF80.57-P-4102-03PP 
    Model 203.0/2/7 as of 24.4.04 GF80.57-P-4102-03PQ 
  Electronic ignition switch control unit, design The EIS control unit (N73) consists of the electromechanical ignition switch, a control unit and an infrared transmitter and receiver.  
  Electronic ignition switch control unit, function The EIS control module (N73) operates with its own microprocessor reading in, checking and relaying data.