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Home >> BMW >> 2021 >> i3 Range Extender >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> General Electrical System -- Repair (I01) >> 61 35 Control Units, Modules >> 61 35 278 Removing and refitting (replacing) body domain controller (BDC)

61 35 278 Removing and refitting (replacing) body domain controller (BDC)

WARNING: High-voltage system - mortal hazard! 
The following points must be strictly observed prior to starting work: 
DE-ENERGIZE THE HIGH-VOLTAGE SYSTEM 
Observe SAFETY INSTRUCTIONS ON HANDLING HYBRID OR ELECTRIC VEHICLES 

Preliminary work needed: 

Unlock plug connections (1) and disconnect.

Release screw (2) and slide BDC control unit (3) upward slightly.

Tightening torque 61 35 1AZ .

Installation note: 

Make sure all plug connections are correctly latched.

G11148355Courtesy of BMW OF NORTH AMERICA, INC.

Release detents (1) and slide BDC control unit (2) upward slightly.

Installation note: 

Please ensure correct latching of the BDC control unit.

G11148356Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Risk of damage to positive battery cable connector!

Unlock the positive battery cable connector: 

  1. Loosen lock (1) in arrow direction.
  2. Unlock top positive battery cable connector (2) in arrow direction.
  3. Disconnect battery positive lead (2).
G13805776Courtesy of BMW OF NORTH AMERICA, INC.

Feed BDC control unit out of holder.

Replacement: 

Carry out VEHICLE PROGRAMMING/CODING .

Resetting additional start lock: