Blind Spot Assist block diagram - GF54.71-P-0003-01LE

MODEL 216.3, 221.0/1 as of model year 2009 up to model year 2011 with CODE 234 (Blind Spot Monitoring) 

MODEL 216.3 as of model year 2011 with CODE 237 (Active Blind Spot Assist) 

MODEL 221.0 (except 221.095), 221.1 (except 221.195) as of model year 2011 with CODE 237 (Active Blind Spot Assist) 

MODEL 221.095/195 as of model year 2011 with CODE 234 (Blind Spot Monitoring) 

Fig 1: Blind Spot Assist - Block Diagram

Courtesy of MERCEDES-BENZ USA