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61 31... Remount operating unit of the additional seat function (screwed version)

Necessary preliminary tasks: 

Removal 

Release all screws by means of screwdriver (1) on the operating unit (2).

Fig 1: Removing Operating Unit Screws
G09881174Courtesy of BMW OF NORTH AMERICA, INC.

Remove the rear panel (1) and feed out the printed circuit board (2).

Fig 2: Identifying Rear Panel And Printed Circuit Board
G09881175Courtesy of BMW OF NORTH AMERICA, INC.

Take out the pressure pin (1) from the operating unit (2).

Fig 3: Removing Pressure Pin From Operating Unit
G09881176Courtesy of BMW OF NORTH AMERICA, INC.

Unclip button (2) with the help of screwdriver (1) and remove.

Fig 4: Removing Operating Unit Button
G09881177Courtesy of BMW OF NORTH AMERICA, INC.

Installation 

Add the button (1) to the operating unit (2) and lock using pressure.

Fig 5: Installing Button To Operating Unit
G09881178Courtesy of BMW OF NORTH AMERICA, INC.

Add pressure pin (1) to the operating unit (2).

Fig 6: Installing Pressure Pin To Operating Unit
G09881179Courtesy of BMW OF NORTH AMERICA, INC.

Add the printed circuit board (2) and then the rear panel (2) to the operating unit.

Fig 7: Identifying Rear Panel And Printed Circuit Board
G09881175Courtesy of BMW OF NORTH AMERICA, INC.

Tighten all screws on the operating unit (2) with the help of screwdriver (1).

IMPORTANT: Pay attention to the freedom of movement and function of the remounted button!
Fig 8: Tightening Operating Unit Screws
G09881174Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work