61 20 900 Disconnecting and connecting battery negative lead

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

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:

REMOVE BATTERY COVER OR OPEN RIGHT LUGGAGE COMPARTMENT TRIM PANEL

Security version:

Remove luggage compartment equipment carrier

Loosen nut (1).

Tightening torque 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off pole shoe.
Do not under any circumstances release socket-head cap screw of IBS.

Fig 1: Identifying Nut

Courtesy of BMW OF NORTH AMERICA, INC.

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