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Dynamic lumbar support on dynamic seat, function - GF91.25-P-2015SX

MODEL 216.3, 221.0 /1 with CODE (432) Left and right dynamic multicontour seat up to Model Year 8 

Fig 1: Identifying Dynamic Lumbar Support On Dynamic Seat Function Diagram
G07643478Courtesy of MERCEDES-BENZ USA

Function requirements 

Function 

In order to prevent tensions in the back during longer drives, the dynamic seats are equipped with the dynamic lumbar support (massage) function.

By pressing the multicontour seat quick select button (A40/9s4) in the front central operating unit, the "Pulse mode" submenu is activated in the COMAND display and the air cushions in the lumbar support area are alternately filled and deflated.

The massage function can be individually set using the turn/push control (A40/9s11):

Pneumatic pump for dynamic seat, component description M40/1 GF91.25-P-5204SX 
Dynamic seat control unit, component description N32/19, N32/22 GF91.25-P-5202SX 
Electronic ignition/starter switch control unit (EIS) component description N73 GF80.57-P-6000SX
Central gateway control unit, component description N93 GF54.21-P-4170SX