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Necessary preliminary tasks

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Disconnect plug connection (1).

Slacken nut (2) on battery negative terminal.

Tightening torque 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off pole shoe.
Do not under any circumstances release socket-head cap screw of IBS.

Detach battery negative lead (3) with intelligent battery sensor (IBS) in upward direction.

Release nut (4) and remove cable.

Fig 1: Identifying Battery Plug Connection, Battery Negative Lead And Nut
G04727443Courtesy of BMW OF NORTH AMERICA, INC.