Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2023M3 COMPETITIONREPAIR AND DIAGNOSISGENERAL INFORMATIONOEM GENERAL INFORMATIONGENERAL ORPHAN DATA (3 OF 4)(DEACTIVATING THE 48 V ELECTRICAL SYSTEM)
2023 BMW M3 Competition
(Deactivating the 48 V electrical system)
2023 BMW M3 CompetitionSECTION (Deactivating the 48 V electrical system)
Precondition
Ignition is switched off
WARNING:
Deactivate the 12-V electrical system
Risk of short circuits! Risk of fire!
Risk of short circuits! Risk of fire!
- Make sure that there is no battery charger connected to the jump start terminal in the engine compartment
- For vehicles with additional electrical systems (48 V electrical system, high-voltage vehicle electrical system), this absolutely must be deactivated before the vehicle battery is disconnected
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.