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61 20 900 Disconnecting and connecting battery negative lead

WARNING:

Observe safety instructions  for handling vehicle battery. (See 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY )

Follow instructions  for disconnecting and connecting battery (See 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY )

Necessary preliminary tasks: 

Disconnect battery negative lead (1).

IMPORTANT: Secure battery negative lead (1) in sideways direction.

Tightening torque 61 21 1AZ.  (See GENERAL ELECTRICAL SYSTEM - TIGHTENING TORQUES article)

Fig 1: Identifying Battery Negative Lead
G04750268Courtesy of BMW OF NORTH AMERICA, INC.