Activating the 48 V electrical system
WARNING: This page is about a different car, the 2022 BMW X7, 2021 BMW X7, 2020 BMW X7, and 2019 BMW X7. However, it is still accessible from the selected car via links, so may be relevant.
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.
Follow-up work
- Refer to INSTALLING THE STEERING COLUMN SWITCH CLUSTER (SZL) .
- Refer to INSTALLING STEERING COLUMN SHROUD LOWER SECTION .
- Refer to FITTING STEERING COLUMN SHROUD UPPER SECTION .
- Refer to INSTALLING THE STEERING WHEEL (SPORTS STEERING WHEEL) .
- Refer to INSTALLING THE AIRBAG UNIT (SPORTS STEERING WHEEL) .
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
- Refer to CHECKING THE AIRBAG FOR FUNCTION .