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61 20 900 Disconnecting and connecting battery earth lead

WARNING: Observe SAFETY INFORMATION for handling hybrid cars.
DE -energize the high-voltage system.
WARNING: Observe the SAFETY INFORMATIONS for handling the battery!
Follow instructions FOR DISCONNECTING AND CONNECTING BATTERY !
Observe notes on POWER SUPPLY /on intelligent battery sensor (IBS).

Necessary preliminary tasks: 

IMPORTANT: Before disconnecting the battery cable, it must be ensured that the vehicle goes to sleep. Observe a waiting period of at least 2 minutes.

Loosen nut (1).

Tightening torque 61 21 1AZ .

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

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

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