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61 20 900 Disconnecting and connecting battery earth lead

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 intelligent battery sensor (IBS) in upward direction, lay to one side and secure.

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