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61 20 900 Disconnecting and connecting battery negative 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 tasks: 

Loosen nut (1).

Tightening torque: see 1AZ in 61 21 BATTERY WITH TERMINAL .

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 Battery Nut
G06894996Courtesy of BMW OF NORTH AMERICA, INC.