Necessary preliminary tasks

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Remove right LUGGAGE COMPARTMENT TRIM PANEL
Partially detach insulating mat

Release screws (1) and pull back device holder (2).

Fig 1: Pulling Back Device Holder And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Unlock catch (2) in direction of arrow and remove trailer module (3) upwards from device carrier (4).

Fig 2: Identifying Trailer Module, Plug Connection And Catch

Courtesy of BMW OF NORTH AMERICA, INC.