Remove/Install Distronic Electric Controller Unit - AR30.30-P-1011LWX

Model 253 (except 253.992/993) 

as of model year 2020 

with code 239 (Active Distance Assist DISTRONIC) 

Fig 1: Active Distance Assist/Distronic Electric Control Unit Components Location - Model 253 As Of 2020 With Code 239

Courtesy of MERCEDES-BENZ USA

	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on preventing damage to electronic components due to a magnetic tool		AH54.00-P-0002-01A
	Remove/install
1	Carry out commissioning of the Active Distance Assist DISTRONIC electric controller unit (A108/1).	When installing new Active Distance Assist DISTRONIC electric controller unit (A108/1).
			AD00.00-P-2000-04B
2	Switch off ignition and store transmitter key outside of transmission range (min. 2 m).
3	Remove Mercedes star.		AR88.40-P-4050LW
4	Release catch hook (1).
5	Disconnect electrical connector from the Active Distance Assist DISTRONIC electric controller unit (A108/1).
6	Remove Active Distance Assist DISTRONIC electric controller unit (A108/1).
7	Install in the reverse order
	Check
8	Perform a test drive thus adjusting the Active Distance Assist DISTRONIC electric controller unit (A108/1).