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Home >> Mercedes Benz >> 2016 >> C450 AMG >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Electrical System, Equipment & Instruments - 205 Chassis - 3 Of 5 >> Testing & Repair >> Remove/Install Active Brake Assist Electric Controller Unit - AR54.21-P-0700LWM

Remove/Install Active Brake Assist Electric Controller Unit - AR54.21-P-0700LWM

Model 205 

as of model year 2019 

with code 258 (COLLISION PREVENTION ASSIST PLUS) 

Shown with CODE P23 (EXCLUSIVE Exterior) 

Fig 1: Active Brake Assist Electric Controller Unit Components Location - Model 205 As Of Model Year 2019 With Code 258; Shown On Model With Code P23
G13021718Courtesy of MERCEDES-BENZ USA

Shown except code P23 (EXCLUSIVE exterior) 

Fig 2: Active Brake Assist Electric Controller Unit Components Location - Model 205 As Of Model Year 2019 With Code 258; Shown On Models Without Code P23
G13021719REMOVINGINSTALLINGREFER TO SELF-DIAGNOSTIC SYSTEMSCourtesy of MERCEDES-BENZ USA
  Notes on preventing damage to electronic components due to a magnetic tool   AH54.00-P-0002-01A
  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Commission Active Brake Assist controller unit (A108). When replacing Active Brake Assist controller unit (A108).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04B
2.1 Remove front bumper. Model 205 as of model year 2019 with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code P23 (EXCLUSIVE exterior)
AR88.20-P-2000LW
2.2 Remove Mercedes star. Model 205 as of model year 2019 with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code 772 (AMG styling package - front spoiler, side skirts and rear apron)
except code P23 (EXCLUSIVE exterior)
Model 205 as of model year 2019
with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code P15 (AVANTGARDE exterior)
except code P23 (EXCLUSIVE exterior)
Model 205 as of model year 2019
with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code P76 (Standard exterior equipment and appointments)
except code P23 (EXCLUSIVE exterior)
AR88.40-P-4050LW
3.1 Remove impact absorber from front bumper. Model 205 as of model year 2019
with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code P23 (EXCLUSIVE exterior)
except code U60 (Active Bonnet (Pedestrian protection))
 
  General information on the impact absorber   AH88.20-P-1000-01A
3.2 Remove pedestrian protection sensors together with impact absorber from front bumper. Model 205 as of model year 2019 with code 258 (COLLISION PREVENTION ASSIST PLUS)
with code P23 (EXCLUSIVE exterior) with code U60 (Active Bonnet (Pedestrian protection))
AR91.60-P-0950LW
4 Disconnect electrical connector (1).    
5 Remove Active Brake Assist controller unit (A108).    
6 Install in the reverse order.    
7 Perform test drive and adjust the Active Brake Assist controller unit (A108) by doing so.