Remove/Install Distronic Distance Pilot Electric Controller Unit - AR54.21-P-0701FR

Model 257 

up to model year 2021 

with code 239 (Adaptive cruise control Pro (DISTRONIC PRO)) 

Fig 1: Distronic Distance Pilot Electric Controller Unit Component Location - Model 257 Up To Model Year 2021 With Code 239

Courtesy of MERCEDES-BENZ USA

Topical note	Notes on preventing damage to electronic components due to a magnetic tool		AH54.00-P-0002-01A
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Carry out commissioning of Distance Pilot DISTRONIC controller unit (A108/1).	When replacing DISTRONIC Distance Pilot controller unit (A108/1).
			AD00.00-P-2000-06FR
2	Remove Mercedes star.		AR88.40-P-4053FR
3	Unscrew nuts (1).	Nut, electric controller unit for Distance Pilot DISTRONIC to body	*BA54.21-P-1001-01E
4	Remove Distance Pilot DISTRONIC controller unit (A108/1) until the electrical connector (2) can be disconnected.
5	Disconnect electrical connection (2).
6	Remove Distance Pilot DISTRONIC controller unit (A108/1).
7	Install in the reverse order
	Calibrate
8	Calibrate Distance Pilot DISTRONIC controller unit (A108/1).
			AD00.00-P-2000-06FR