Remove/Install Electronic Ignition Lock Control Unit - AR54.21-P-0038LWM

Model 205 

as of model year 2019 

Model 253 (except 253.992/993) 

as of model year 2020 

Model 293 

Fig 1: Electronic Ignition Lock Control Unit Components Location - Model 205 As Of Model Year 2019

Courtesy of MERCEDES-BENZ USA

Shown on model 205 as from model year 2019 

	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Perform commissioning of ignition lock control unit (N73).	When replacing ignition lock control unit (N73).
		Model 205 as of model year 2019 Model 253 (except 253.992/993) as of model year 2020	AD00.00-P-2000-04B
		Model 293	AD00.00-P-2000-06FR
2	Switch off ignition and store transmitter key outside of transmission range (min. 2 m).
3	Remove front seat on right side.	Model 205.0/1/2/3 as of model year 2019 Model 253 (except 253.992/993) as of model year 2020 Model 293	AR91.10-P-1000LW
		Model 205.4 as of model year 2019	AR91.10-P-1000LWR
4	Fold rear right floor covering toward rear until ignition lock control unit (N73) is accessible.		AR68.20-P-4800LW
5	Disconnect electrical connector (1).
6	Release retaining clips (2) by pressing in catch hooks (arrows) and remove ignition lock control unit (N73).
7	Install in the reverse order.