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Home >> Mercedes Benz >> 2021 >> Metris Van Cargo >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Seats, Bunks, Restraint Systems (1 Of 4) -- 447 Chassis >> Basic Knowledge >> Massage Function Control Unit, Component Description >> Massage Function Control Unit, Component Description - GF91.25-S-5212TRF
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Massage Function Control Unit, Component Description - GF91.25-S-5212TRF

Model 447 

With Code U90 (Left luxury seat of 1st seat row) 

With Code XM0 (Facelift) 

Except Code XM7 (MOPF II) 

Model 447 

With Code U91 (Right luxury seat of 1st seat row) 

With Code XM0 (Facelift) 

Except Code XM7 (MOPF II) 

Fig 1: Massage Function Control Unit Components Location - Model 447 With Code U90, XM0, UM91, Except Code XM7
G16502082Courtesy of MERCEDES-BENZ USA

Location 

The left 1st rear seat row massage function control unit (N32/47) or right 1st rear seat row massage function control unit (N32/48) is in the backrest frame of the left 1st rear seat row or right 1st rear seat row.

Tasks 

The massage function control unit actuates the massage function for the respective rear seat according to the request from the following control units:

The request is forwarded via the left 1st rear seat row seat heating/ventilation control unit (N32/12) or right 1st rear seat row seat heating/ventilation control unit (N32/13) to the integrated regulating valve unit.

At the same time, the left 1st rear seat row massage insert air cushion pneumatic pump (M25/15) or right 1st rear seat row massage insert air cushion pneumatic pump (M25/16) is actuated as per the request.

Structure 

The left 1st rear seat row massage function control unit or right 1st rear seat row massage function control unit contains the following component parts:

  Overview of system components for electric seats   GF91.29-S-9992TRF