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61 20 900 Disconnecting and connecting battery earth lead

WARNING: Observe SAFETY INSTRUCTIONS  for handling vehicle battery.
Follow instructions for DISCONNECTING AND CONNECTING BATTERY .
Observe notes on INTELLIGENT BATTERY SENSOR (IBS) .

Necessary preliminary work: 

Removal: 

Release clips (1).

Fold up storage shelf (2).

Fig 1: Identifying Storage Shelf And Clips
G09950153Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Detach battery earth lead with intelligent battery sensor (IBS) in upward direction, lay to one side and secure.

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.
Fig 2: Identifying Battery Earth Lead Nut
G06894996Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Insert battery earth lead with intelligent battery sensor (IBS) and tighten with nuts (1).

Tightening torque 61 21 1AZ .

Fig 3: Identifying Battery Earth Lead Nut
G06894996Courtesy of BMW OF NORTH AMERICA, INC.

Insert storage shelf (2) and fasten with clips (1).

Fig 4: Identifying Storage Shelf And Clips
G09950153Courtesy of BMW OF NORTH AMERICA, INC.