Remove/install electronic ignition switch control unit - AR80.57-P-1000GM

MODEL 463.202 /222 /236 /237 /243 /244 /245 /246 /247 /248 /249 /250 /254 /270 /271 /303 /306 /309 /322 /323 /332 /333 /336 /340 /341 /346 

Fig 1: Identifying EIS Control Unit Components

Courtesy of MERCEDES-BENZ USA

	Removal/installation
1	Activate Service mode in Tele-Aid emergency call system	Only with code (ET2) TELE AID car telephone call system	AR82.95-P-0005-03GR
	Notes regarding the Tele-Aid emergency call system		AH82.95-P-0001-01GA
	Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and goggles. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
2	Disconnect battery ground line	Except model 463.236/248 with code (979) Special protection version	AR54.10-P-0003G
		Model 463.236/248 with code (979) Special protection version, with code (ZS6) Special protection version FB6, with code (E26) Additional battery 100 Ah incl. cutoff relay Model 463.236/248 with code (979) Special protection version, with code (ZS7) Special protection version FB7, with code (E26) Additional battery 100 Ah incl. cutoff relay	AR54.10-P-0003PM
	Notes on battery	All models	AH54.10-P-0001-01A
3	Remove transmitter key
4	Remove bottom section of dashboard on driver's side		AR68.10-P-1505GM
5	Remove ignition lock control cable (2) from EIS control unit (N73)	Transmission 722.610 in model 463.244/245/250 Transmission 722.630 in model 463.243/246/247/248/249/254 Transmission 722.637 in model 463.322/323 Transmission 722.638 in model 463.309/332/333 Transmission 722.645 in model 463.270/271 Transmission 722.902 in model 463.303/306/336/340/341/346 Transmission 722.904 in model 463.202/222/236/237 Press retaining lugs (1) together, move ignition lock cable (2) in sliding direction (arrow) and remove.	AR27.60-P-0122GM
6	Disconnect electrical connectors from EIS control module (N73)
7	Install in the reverse order	Installation:  When replacing EIS control module (N73) program according to programming instructions.
8	Deactivate service mode in TELE AID emergency call system	Only with code (ET2) TELE AID car telephone call system	AR82.95-P-0005-03GR
	Notes regarding the Tele-Aid emergency call system		AH82.95-P-0001-01GA
9	Read out fault memory and erase	Stored faults which may be caused by assembly work, test work, removed lines or a simulation, must be processed and erased in fault memories after completing the work.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
10	Check ignition switch lock for proper function	The selector lever may only be capable of being shifted from the "P" position, when the transmitter key is in position "2" and the brake pedal pressed. The transmitter key should only be capable of being removed when the selector lever is in position "P".