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61 20 900 Disconnecting and connecting battery earth lead

WARNING: Observe SAFETY INFORMATIONS  for handling vehicle battery.
Follow INSTRUCTIONS for disconnecting and connecting battery
IMPORTANT: Do not under any circumstances use force to pull/lever off INTELLIGENT BATTERY SENSOR (IBS) !

Necessary preliminary tasks: 

Loosen nut (1).

Tightening torque 61 21 1AZ .

Disconnect battery earth lead (3) and secure at side.

Fig 1: Identifying Earth Lead And Nut
G09863385Courtesy of BMW OF NORTH AMERICA, INC.