Deactivating the 48 V electrical system

• Deactivate the 48 V electrical system by opening the hood.

  The deactivation takes place automatically.

Courtesy of BMW OF NORTH AMERICA, INC.

Determining the 48 V electrical system is de-energized 

Check 

• Press the START-STOPPING button quickly 3 times without stepping on the brake pedal to establish the PAD mode.
• Check that the instrument cluster (KOMBI) is de-energized in PAD mode.

Courtesy of BMW OF NORTH AMERICA, INC.

Desired state 

• The Check Control message "48 V electrical system switched off." Or "Electrical additional storage switched off." (1) is displayed.

Result 

» Lack of voltage  cannot be determined with the Check Control message "48 V electrical system switched off." Or "Electrical additional storage switched off." (1). Work start is not permitted.

Measure

• Repeat the "deactivate 48 V electrical system" service function.
  • Vehicle management > service function > voltage supply > deactivate 48 V electrical system

    Only if the Check Control message "48-volt on-board network switched off." Or "Electrical additional storage switched off." (1) is displayed in the instrument cluster (KOMBI), the 12V battery may be disconnected.

Result 

» Lack of voltage  cannot be determined with the Check Control message "48 V electrical system switched off." Or "Electrical additional storage switched off." (1). Work start is not permitted.

Measure: 

48-V battery with fault code related to relay is stuck in closed position and de-energized

Result 

» The Check Control message reports that 48 V electrical system is switched off.

Measure

• Exit PAD mode by pressing the START-STOPPING button once without stepping on the brake pedal.

  "Disconnect the negative battery cable of the 48-V battery" work can be started.