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61 20 900 Disconnecting and connecting battery negative lead

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WARNING: Observe safety instructions   for handling vehicle battery.

Follow instructions for disconnecting and connecting battery   .


Follow instructions on intelligent battery sensor (IBS)   .

Necessary preliminary tasks: 

IMPORTANT: Do not under any circumstances detach or lever off intelligent battery sensor (2) from battery by force.

Loosen nut (1). Tightening torque, see 61 21 1AZ  in 61 21 BATTERY WITH TERMINAL .

Remove intelligent battery sensor (2) from battery and secure to side.

Fig 1: Identifying Battery Sensor And Nut
G06213453Courtesy of BMW OF NORTH AMERICA, INC.