Collision Warning System Controller Unit, Detailed Information - GF30.30-P-9893-01B

Model 167, 293 

Fig 1: Collision Warning System Controller Unit Components Location - Model 167

Courtesy of MERCEDES-BENZ USA

Location 

The Active Brake Assist controller unit (model 167) or the collision warning system radar sensor (model 293) is located in the center behind the radiator grille.