Remove/install pedestrian protection sensor - AR91.60-P-0950RK

MODEL 172.4 as of 10/31/11 with CODE U60 (Active Bonnet (Pedestrian protection)) 

MODEL 231 with CODE U60 (Active Bonnet (Pedestrian protection)) 

Shown on model 231 

Fig 1: Pedestrian Protection Sensor Remove/Install Components - Shown On Model 231

Courtesy of MERCEDES-BENZ USA

	General information on the impact absorber		AH88.20-P-1000-01A
	Notes on pedestrian protection sensor		AH91.60-P-0001-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove front bumper (1).	Model 172.4 as of 10/31/11 with code U60 (Active Bonnet (Pedestrian protection))	AR88.20-P-2000W
		Model 231 with code U60 (Active Bonnet (Pedestrian protection))	AR88.20-P-2000RK
2	Set down front bumper (1) on a suitable base
3	Remove hose (4) from groove in impact absorber (3)	Ensure that hose (4) is seated correctly in impact absorber (3). Hose (4) must be routed without tension or kinks. Malfunctions can occur otherwise. The hose (4) must be seated as deeply as possible within the groove of the impact absorber (3) and have the same protrusion length at left and right.
4	Disconnect electrical connectors at left front bumper pedestrian protection sensor (B151/1) and right front bumper pedestrian protection sensor (B151/3)
5	Remove left and right expansion rivet (2)
6	Remove left front bumper pedestrian protection sensor (B151/1) and right front bumper pedestrian protection sensor (B151/3) together with hose (4) from front bumper (1)	Left front bumper pedestrian protection sensor (B151/1) and right front bumper pedestrian protection sensor (B151/3) must not be disconnected from hose (4). Malfunctions can occur otherwise.
7	Install in the reverse order