61 12 013 Replacing negative battery lead

WARNING: Observe safety information for HANDLING VEHICLE BATTERY .
Follow instructions for DISCONNECTING AND CONNECTING BATTERY .
Follow instructions on INTELLIGENT BATTERY SENSOR (IBS) .

Necessary preliminary tasks:

Loosen nut (1). Tightening torque 61 21 1AZ .

Disconnect battery negative lead (3) from battery.

Version with intelligent battery sensor (IBS):

Detach plug connection from IBS.

Slacken nut (2). Tightening torque 61 21 4AZ .

Feed out battery negative lead (3) and remove.

Fig 1: Identifying Battery Negative Lead And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.