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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBMW2023M3 BASE, STANDARD TRANSREPAIR AND DIAGNOSISGENERAL INFORMATIONOEM GENERAL INFORMATIONGENERAL ORPHAN DATA (3 OF 4)(ACTIVATING THE 48 V ELECTRICAL SYSTEM)
2023 BMW M3 Base, Standard Trans
(Activating the 48 v electrical system)
2023 BMW M3 Base, Standard TransSECTION (Activating the 48 v electrical system)
Precondition
Ignition is switched off
NOTE:
RISK OF DAMAGE
Damage to the 48-V battery
If a 48-V battery that is disconnected from the electrical system is activated, the battery electronics will be damaged
Damage to the 48-V battery
If a 48-V battery that is disconnected from the electrical system is activated, the battery electronics will be damaged
- Only ever activate the 48 V electrical system when the 48 V battery is fully connected up
- Raise the battery ground cable (1)
- Remove special tool 2 452 007
- Release the negative battery cable (2) of the 48-V battery from the attachment
- Position the negative battery cable (2) of the 48-V battery on the negative battery terminal
- Tighten the nut (1)(TIGHTENING TORQUE SPECIFICATIONS)
Negative battery cable to 48-V battery Nut M8 tightening torque 19 Nm - Connect the connector (1) of the CAN bus and lock it
- Clip in the clip (2)
- Activate the 48 V electrical system by closing the hood
The activation takes place automatically
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.