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Home >> BMW >> 2025 >> 230i >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> General Electrical System -- Repair (G42) >> 61 20 Battery Ground Cable, Power Reset >> 61 20 900 Disconnecting and connecting battery ground lead >> 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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Instructions for 12-V dual storage system

Notes on 48-V battery

Result 

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

Measure

Result 

» 48-V battery is installed.

Measure

Result 

» 12-V dual storage battery is installed.

Measure