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

MODEL 171.4 

Fig 1: Identifying Battery Ground Line Components
G05027857Courtesy of MERCEDES-BENZ USA
  Disconnect, connect    
DANGER 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 Remove transmitter key from electronic ignition switch control unit and ensure that all consumers are switched off    
2 Open engine hood and move to vertical position   AR88.40-P-1000V
3 Open quick-release fittings (1) and remove air duct (2)    
4 Loosen nut (3) and remove ground line (4) from negative terminal (5) of the battery (G1) NOTESInstallation:  Ensure that the ground line (4) is seated firmly, otherwise the negative terminal (5) may be damaged.  
5 Connect in the reverse order.    
6 Perform basic programming   AR00.19-P-0200V