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61 13... Crimping Micro Quadlock System contacts (MQS)

Special tools required: 

To crimp MQS contacts, use pliers 61 4 321 (1) in conjunction with crimping head 61 4 324 (2) from crimping set 61 4 320. 

NOTE: Pliers (1) open automatically as far as they will go when handles are pressed together.
Fig 1: Pliers And Crimping Head
G05513403Courtesy of BMW OF NORTH AMERICA, INC.

Open pliers (1).

Fold up contact carrier (2).

Insert MQS contact (3) in contact carrier (2).

Fold back contact carrier (2).

Fig 2: Identifying MQS Contact, Contact Carrier And Pliers
G04753310Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Follow procedure for cutting and stripping insulation  from cables.

Close pliers (1) one notch.

Insert stripped cable (2).

Close pliers (1) fully.

Fig 3: Identifying Pliers And Stripped Cable
G04753311Courtesy of BMW OF NORTH AMERICA, INC.

Open pliers (1).

Open contact carrier (2) gently and carefully remove MQS contact.

NOTE: Check contact for correct crimping. 
Fig 4: Identifying Contact Carrier And Pliers
G04753312Courtesy of BMW OF NORTH AMERICA, INC.