61 13... In-Line plugs, 4-pin, system DFK ELA

Press retaining hook in direction of arrow and remove lock (1).

Fig 1: Removing Lock By Pressing Retaining Hook

Courtesy of BMW OF NORTH AMERICA, INC.

Installation notes: 

If necessary, side lock must also be unlocked with screwdriver.

Fig 2: Unlocking Side Lock Using Screwdriver

Courtesy of BMW OF NORTH AMERICA, INC.

With special tool 61 0 316 (61 1 136), unlock contact and pull out cable with contact (1) towards rear.

Fig 3: Pulling Out Cable With Contact Using Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.