61 20 900 Disconnecting And Connecting Battery Negative Lead
WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. 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:
Security version:
Loosen nut (1).
Tightening torque: 61 21 1AZ . See BATTERY WITH TERMINAL for specs.
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.
Detach battery negative lead with IBS towards top, lay to one side and secure.