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Front seat adjustment motor group, location/function - GF91.29-P-2103C

MODEL 210 as of 1.7.99 except CODE (275a) Memory package (driver's seat, steering column, rearview mirrors) 

The driver-side semi-electric seat adjustment motor group (M25)  consists of motors for raising and lowering the seat height (M25m1) and moving the seat backrest forward and back (M25m2).

The passenger-side semi-electric seat adjustment motor group (M26)  consists of the motors for raising and lowering the seat height (M26m1) and moving the seat backrest forward and back (M26m2).

Illustration 

Driver-side semi-electric seat adjustment motor group (M25) 

Fig 1: Identifying Motor For Raising And Lowering Seat Height Moving Seat Backrest Forward And Back
G04632684Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  Front seat adjustment motor group, function The motors are permanently excited DC motors. They are equipped with thermal switches for protection against overheating.