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61 20 900 Disconnecting And Connecting Battery Negative Lead

WARNING: Observe safety instructions  for handling vehicle battery. See 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .
Follow instructions for disconnecting and connecting battery !  See 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Observe notes on power supply  /on intelligent battery sensor (IBS).

Necessary preliminary tasks: 

Security version: 

Loosen nut (1).

Tightening torque 61 21 1AZ.  See GENERAL ELECTRICAL SYSTEM - TIGHTENING TORQUES .

IMPORTANT: Do not under any circumstances use force to pull off pole shoe.
Do not under any circumstances release socket-head cap screw of IBS.

Detach battery negative lead with IBS towards top, lay to one side and secure.

Fig 1: Identifying Nuts
G04768534Courtesy of BMW OF NORTH AMERICA, INC.