Necessary preliminary tasks

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Remove outer cover . See 5213040 REMOVING AND INSTALLING/REPLACING OUTER COVER ON LEFT OR RIGHT FRONT SEAT BACKREST or 5214040 REMOVING AND INSTALLING/REPLACING OUTER COVER ON FRONT LEFT OR RIGHT SEAT (NORMAL) on front seat.

Disconnect plug connection (1).

Unlock retaining tab (2) in direction of arrow.

Remove switch for backrest width adjustment (3) in direction of arrow.

Fig 1: Removing Switch For Backrest Width Adjustment

Courtesy of BMW OF NORTH AMERICA, INC.