Remove/Install Relay Of ECO Start/Stop Function Auxiliary Battery - AR54.15-S-2002EE

Model 447 

With Code D50 (Full-length partition) 

Model 447 

With Code D51 (Entire partition with 1 window) 

Model 447 

With Code MJ8 (ECO start/stop function) 

With Code S23 (Co-driver's seat double seat) 

Fig 1: Relay Of ECO Start/Stop Function Auxiliary Battery Components Location - Model 447 With Code D50, D51, MJ8, S23

Courtesy of MERCEDES-BENZ USA

	Risk of fire  /risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning  caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death  due to voltage U >= 30 V AC and U >= 60 V DC.	No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on battery		AH54.10-P-0001-01A
Notice	Notes on carrying out repair work in the vehicle interior		AH68.00-D-0001-01KOS
	Remove/install
1	Switch off ignition, remove transmitter key and store it outside of transmission range (min. 2 m).
2	Remove nuts (1), loosen Velcro fastener (arrow) and detach cover panel (2) from right seat base.	When removing the cover panel (2), make sure that the cover panel (2) does not come into contact with the busbar (3). Otherwise a short circuit will occur which can damage the electrical system.
3	Disconnect ground line (4) from support battery.	Bolt, ground line to backup battery negative terminal	*BA54.10-Z-1005-01KOF
4	Remove screw (5) from support battery positive terminal.	Bolt, busbar to backup battery positive terminal	*BA54.10-Z-1004-01KOF
5	Remove nut (6) and remove busbar (3).	Nut, busbar to relay for backup battery	*BA54.10-Z-1003-01KOF
6	Remove nut (7) and detach electrical wiring harness (8) from on-board electrical system support battery relay (K120).	Nut, wiring harness to backup battery relay	*BA54.18-Z-1003-02KOA
7	Detach electrical connection (9).
8	Remove nuts (10) and remove on-board electrical system support battery relay (K120) from battery carrier.
9	Install in the reverse order.