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Remove both front seats

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WARNING: Pyrotechnic components. 
Danger! Immobilization period-threatening injuries! 
NOTE: Description is for left component only. Procedure on the right side is identical.
G11108604Courtesy of BMW OF NORTH AMERICA, INC.

Remove rear seat rail trim 

G14196462Courtesy of BMW OF NORTH AMERICA, INC.

Removing the front seat rail trims 

G14196463Courtesy of BMW OF NORTH AMERICA, INC.

G11108606Courtesy of BMW OF NORTH AMERICA, INC.

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! 
  • 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.
WARNING: Deactivate the 48-V electrical system. 
Risk of short circuits! Risk of fire! 
  • Make sure that there is no charger  connected to the jump start terminal in the engine compartment.
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.
G14192777Courtesy of BMW OF NORTH AMERICA, INC.

Check 

NOTE: TECHNICAL INFORMATION 
Zero voltage (48 V electrical system switched-off) is only displayed in PAD mode.
G14192778Courtesy of BMW OF NORTH AMERICA, INC.

Desired state 

Result 

Absence of voltage  cannot be specified with the Check Control message "48 V electrical system switched off." (1)  . Work start is not permitted.

Measure

Only if the Check Control message "48 V electrical system switched off." (1)  is displayed in the instrument cluster (KOMBI), the 12V battery may be disconnected.

Contact the technical support if the absence of voltage is not clearly given. 

Result 

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

Measure

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

G14192781Courtesy of BMW OF NORTH AMERICA, INC.

Disconnecting all battery negative leads 

G13797979Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: RISK OF DAMAGE 
Careless handling of tools and sharp-edged components. 
Scratches, surface damage. 
  • Protect working area.
  • Handle tools and components carefully.