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Remove/Install Parktronic System (PTS) Sensors In Rear Bumper - AR54.65-P-0002MFA

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Model 118, 247 

with code 235 (Parking Pilot with PARKTRONIC) 

Model 177 

with code 235 (Active Parking Assist with PARKTRONIC) 

Fig 1: Parktronic System (PTS) Sensors In Rear Bumper Components Location - Model 118 With Code 235
G16050559REMOVINGINSTALLINGINSPECTCourtesy of MERCEDES-BENZ USA
Topical note  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Remove rear bumper (1)   AR88.20-P-2200MFA
2 Release and disconnect electrical connectors (2)    
3 Pull locks (3) lightly outwards and remove rear parking system distance sensors (B8/7, B8/8, B8/9, B8/10, B8/11, B8/12) from bumper (1)    
INSPECT Check     
4 Check respective seal of rear parking system distance sensors (B8/7, B8/8, B8/9, B8/10, B8/11, B8/12). In the event of complaints

Replace corresponding seal.
 
5 Install in the reverse order