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61 20 900 Disconnecting and connecting negative battery cable

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WARNING: Observe SAFETY INSTRUCTIONS  for handling vehicle battery.

Follow instructions for DISCONNECTING AND CONNECTING BATTERY  !

Observe notes on POWER SUPPLY  /on intelligent battery sensor (IBS).

Necessary preliminary work: 

Loosen nut (1).

Tightening torque 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.

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

Fig 1: Identifying Battery Nut
G06894996Courtesy of BMW OF NORTH AMERICA, INC.