61 20... Disconnecting and connecting battery earth lead (auxiliary battery)

WARNING: Observe SAFETY INFORMATION for handling hybrid cars.
Disconnect high-voltage system from power.

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

Remove service flap (1) from luggage compartment trim panel on the right.

Fig 1: Removing Service Flap From Luggage Compartment Trim Panel

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Before disconnecting the battery earth lead, it must be ensured that the vehicle goes to sleep. Observe a waiting period of at least 2 minutes.

Loosen nut (1).

Tightening torque: 61 21 1AZ .

Disconnect battery earth lead (2) from battery and secure at side.

Fig 2: Identifying Nut And Battery Earth Lead

Courtesy of BMW OF NORTH AMERICA, INC.