Disconnect/connect battery ground line - AR54.10-P-0003LW

MODEL 205 

MODEL 253 

Shown on model 205 except code ME04 (Mild hybrid drive) and except code ME06 (Hybrid drive 50 KW variant (Including plug-in)) 

Fig 1: On-Board Electrical System Battery, Ground Cable, Cover And Nut - Shown On Model 205 Except Code ME04

Courtesy of MERCEDES-BENZ USA

MODEL 205 with CODE ME04 (Mild hybrid drive) or with CODE ME06 (Hybrid drive, 50 kW variants (including plug-in)), shown on MODEL 205.0 with CODE ME04 (Mild hybrid drive) 

Fig 2: On-Board Electrical System Battery, Ground Cable, Cover And Nut - Model 205 With Code ME04

Courtesy of MERCEDES-BENZ USA

	Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
	Risk of death  when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who wear electronic implants (e.g. cardiac pacemakers), must not  carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
	Risk of injury  caused by contact with battery gel when handling damaged lead-gel batteries	No fires, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses.	AS54.10-Z-0001-02A
	Risk of explosion  from explosive gas. Risk of poisoning and caustic burns  from swallowing battery electrolyte. Risk of injury  through burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fires, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Risk of injury  caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte or due to short circuit. Risk of burn injuries  due to thermal changes. Risk of poisoning  from swallowing battery electrolyte.	Wear protective gloves, protective clothing and safety glasses. In the event of escaping battery electrolyte, battery vapors, battery mist, smoke or heat development, secure the area, leave it and alert the fire department.	AS54.10-Z-0001-04A
	Note on high-voltage on-board electrical system		AH54.00-P-0010-01A
	Notes on battery		AH54.10-P-0001-01A
	Notes for 12-V lithium-ion battery		AH54.10-P-0004-01A
	Notes on sensor system for trunk lid opening/closing		AH80.61-P-0001-01A
	Notes on AGM battery		AH54.10-P-0002-01A
	Disconnect, connect
1	Switch off ignition and remove transmitter key	All electrical consumers must be switched off. They may otherwise be damaged when the ground line (3) is disconnected/connected.
2.1	Open engine hood	Model 205 except code ME04 (Mild hybrid drive) except code ME06 (Hybrid drive 50-KW variant (incl. plugin)) Model 253
2.2	Unlock engine hood	Model 205 with code ME04 (Mild hybrid drive) Model 205 with code ME06 (Hybrid drive 50-KW variant (incl. plugin)) Due to the open engine hood contact switches, the pre-conditioning is deactivated and it is thus ensured that no currents can flow in the 12-V on-board electrical system.
3.1	Fold up load compartment floor (4) and hook into place	Model 205.0 with code ME04 (Mild hybrid drive)
3.2	Remove load compartment floor rear section	Model 205.0/1 with code ME06 (Hybrid drive 50-KW variant (incl. plugin)) Model 205.2 with code ME04 (Mild hybrid drive)
3.3	Fold over load compartment floor rear section	Model 205.2 with code ME06 (Hybrid drive 50-KW variant (incl. plugin))
4.1	Remove cover (5)	Model 205 with code ME04 (Mild hybrid drive) Model 205 with code ME06 (Hybrid drive 50-KW variant (incl. plugin))
4.2	Remove cover (1)	Model 205 except code ME04 (Mild hybrid drive) except code ME06 (Hybrid drive 50-KW variant (incl. plugin)) Model 253
5	Loosen nut (2) and remove ground line (3) from negative terminal of on-board electrical system battery (G1)	Nut, electrical line to negative terminal/positive terminal for on-board electrical system battery	*BA54.10-P-1004-01A
	Check
6	Using a diode test lamp, check the electrical system for voltage between the positive line of the on-board electrical system battery (G1) and the disconnected ground line (3)	Model 205 with code ME04 (Mild hybrid drive) Model 205 with code ME06 (Hybrid drive 50-KW variant (incl. plugin)) Diode test lamp lights up: ↓ Detach ground line from additional battery and check the on-board electrical system after completing the work.
			AR54.10-P-0007LW
		Cover positive line of on-board electrical system battery (G1). Otherwise, a short circuit may occur.
7	Connect in the reverse order
8	Set time in radio	Model 205 except code 531 (COMAND APS) Model 253 except code 531 (COMAND APS)