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Home >> BMW >> 2021 >> 750i xDrive >> Repair and Diagnosis >> Accessories & Equipment >> Steering Column Switches >> General Electrical System -- Repair (G12) (1 Of 2) >> 61 20 Battery, General Information >> 61 20 900 Disconnecting and connecting battery ground lead (All negative battery cables) (740i 2016-2022, 740i xDrive 2017-2022, 750i 2016-2019, 750i xDrive 2016-2022, M760i xDrive 2017-2022) >> Disconnecting the negative battery cable of the auxiliary battery in the engine compartment

Disconnecting the negative battery cable of the auxiliary battery in the engine compartment

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Notes on 48-V battery

Instructions for 12-V dual storage system

Result 

» The auxiliary battery is not installed in the engine compartment.

Measure

Result 

» Vehicle electrical system support battery is installed.

Measure

Result 

» 12-V dual storage battery is installed.

Measure

Result 

» 48 volt battery is installed.

Measure