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

MODEL 171

Fig 1: Identifying Electronic Ignition Switch Control Unit Components

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

5.7.06

"Disconnect/connect battery ground line" removed

	Remove / install
	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 glasses. Only pour battery acid into suitable and appropriately marked containers.
1	Completely move steering column downward or press completely downward
2.1	Move selector lever to position "P"	Vehicles with automatic transmission
3.1	Read out version coding of EIS control unit (N73)	When replacing EIS control unit: Connect STAR DIAGNOSIS and read in data for EIS control unit (N73) in STAR DIAGNOSIS. Installation: Transmit stored data to new EIS control unit (N73).
		STAR DIAGNOSIS diagnosis system	*WE58.40-Z-1013-06A
4	Remove key from EIS control unit (N73)
5	Remove cover below instrument panel		AR68.10-P-1500V
6	Unscrew trim ring (36a) from lower section of instrument panel with claw wrench (020).	Claw-type wrench for ignition / starter switch trim ring	Fig 2
7	Remove EIS control unit (N73) downward
8.1	Unscrew ignition switch cable (36h)	Vehicles with automatic transmission	AR27.60-P-0122-01V
9	Disconnect electrical connectors
10	Install in the reverse order
11	Perform a function test	Vehicles with automatic transmission: It should only be possible to move the selector lever out of position "P" when the key is position "2" and the brake pedal pressed. It should only be possible to remove the key when the selector lever is in position "P".
12	Read out fault memory with STAR DIAGNOSIS		*WE58.40-Z-1013-06A

Fig 2: Identifying Claw-Type Wrench For Rosette On Ignition Switch (210 589 00 07 00)

Courtesy of MERCEDES-BENZ USA

WORKSHOP EQUIPMENT/MB TESTERS (SEE WORKSHOP EQUIPMENT MANUAL)

WE58.40-Z-1013-06A

STAR DIAGNOSIS Compact diagnosis system for passenger cars, order number 6511 1801 00