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

Model 257 

Model 290 

Shown on model 257 

Fig 1: Electronic Ignition Lock Control Unit Component Location - Model 257

Courtesy of MERCEDES-BENZ USA

Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove/install
1	Carry out commissioning of electronic ignition lock control unit (N73).	When replacing the electronic ignition lock control unit (N73).
			AD00.00-P-2000-06FR
2	Move driver seat to rearmost position.
3	Disconnect ground line from battery.		AR54.10-P-0003FR
4	Remove door sill in driver footwell.
5	Fold back floor covering in driver footwell.
6	Release catch hook (2) and move electronic ignition lock control unit (N73) out of guide (arrow).	Hook electronic ignition lock control unit (N73) onto guide (arrow), then clip into place.
7	Disconnect electrical connector (1) and remove electronic ignition lock control unit (N73).
8	Install in the reverse order.