Disconnect the positive battery cable from the front power distribution

WARNING: Working on 12 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.
• Detach battery ground lead from battery.
• For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.

• Remove the cover (1)  from the detents (2)  .
• Remove the cover (1)  in an upwards direction.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Loosen nuts (2)  .
• Remove the positive battery cable and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.