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61 20 900 Disconnecting and connecting battery earth lead

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

Necessary preliminary tasks: 

For F20; F21; F22; F23: 

For F30; F32; F35; F80; F82: 

F31 For: 

For F33; F34; F36; F83: 

NOTE: With lead-acid battery (F2x only).

Loosen nut (1).

Tightening torque: 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.
Fig 1: Battery Earth Lead And Nut
G10098402Courtesy of BMW OF NORTH AMERICA, INC.

Pull off battery earth lead (2) and IBS in an upward direction, place to one side and secure.

NOTE: With lead-acid battery (F3x only).

Loosen nut (1).

Tightening torque: 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.
Fig 2: Battery Earth Lead And Nut
G10098406Courtesy of BMW OF NORTH AMERICA, INC.

Pull off battery negative lead and IBS (2) in an upward direction, place to one side and secure.

NOTE: For lithium ion battery (only F8x).

Loosen nut (1).

Tightening torque: 61 21 1AZ .

IMPORTANT: Do not under any circumstances use force to pull off negative terminal.
Fig 3: IBS And Nut
G10098407Courtesy of BMW OF NORTH AMERICA, INC.

Pull negative battery cable (2) up and off, place to one side and secure.