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61 20 900 Disconnecting and connecting battery earth lead

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

Fig 1: Identifying Nut
G10064125Courtesy of BMW OF NORTH AMERICA, INC.