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61 12 013 Replacing negative battery lead

WARNING: Observe safety informations  See 12 00... NOTES FOR DISCONNECTING AND CONNECTING BATTERY or 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY  for handling vehicle battery.
Follow instructions on INTELLIGENT BATTERY SENSOR (IBS) .

Necessary preliminary work: 

Disconnect plug connection (1).

Loosen nut (2) of negative battery terminal.

Tightening torque 61 21 1AZ .

IMPORTANT: Do not use force to pull off pole shoe under any circumstances.
Do not under any circumstances release socket-head cap screw of IBS.
Fig 1: Identifying Plug Connection, IBS Sensor And Nuts
G09895658Courtesy of BMW OF NORTH AMERICA, INC.

Pull off battery earth lead (3) with intelligent battery sensor (IBS) upwards.

Release nut (4) and remove cable.

Tightening torque 61 21 5AZ .