61 20 900 Disconnecting and connecting battery negative lead

WARNING: Observe SAFETY INSTRUCTIONS for handling vehicle battery.
Follow instructions FOR DISCONNECTING AND CONNECTING BATTERY !
Observe notes on POWER SUPPLY /on intelligent battery sensor (IBS).

Necessary preliminary tasks

Loosen nut (1).

Tightening torque 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.

Detach battery negative lead with IBS towards top, lay to one side and secure.

Fig 1: Identifying Front Luggage Compartment Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Via BMW diagnosis system: