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HOMESERVICE MANUALSBMW2023X5 M BASEREPAIR AND DIAGNOSISGENERAL INFORMATIONOEM GENERAL INFORMATIONGENERAL ORPHAN DATA (1 OF 2)ACTIVATING THE 48 V ELECTRICAL SYSTEM
2023 BMW X5 M Base

Activating the 48 V electrical system

2023 BMW X5 M BaseSECTION 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. 
  • 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. 
    G14192781Courtesy of BMW OF NORTH AMERICA, INC.
  • 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 TORQUES SPECIFICATION

    Negative battery cable to 48-V battery 
    Nut M8 Tightening torque  19 Nm
    G14192780Courtesy of BMW OF NORTH AMERICA, INC.
  • Connect the connector (1) of the CAN bus and lock it.
  • Clip in the clip (2).
    G14192779Courtesy of BMW OF NORTH AMERICA, INC.
  • Activate the 48 V electrical system by closing the hood.

    The activation takes place automatically.

    G14192798Courtesy of BMW OF NORTH AMERICA, INC.
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.