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)
Courtesy of MERCEDES-BENZ USA