Multicontour Seat Control Unit (MCS), Component Description - GF91.25-P-5201GN

MODEL 166

as of model year 2016

with CODE 399 (Multicontour front seats with massage function)

MODEL 292

with CODE 399 (Multicontour front seats with massage function)

Shown on driver seat

Fig 1: Multicontour Seat Control Unit Component Location - Model 166

Courtesy of MERCEDES-BENZ USA

Location

The multicontour seat control units are located at the bottom on the backrest frame of the respective seat.

Tasks

The multicontour seat control unit does the following:

Inflation and deflation of the multicontour seat air cushions
Saving and adjusting stored pressure values when the memory function is called up (with CODE 275 (Memory package) or CODE P64 (Memory package))
Monitoring of internal piezo valves (shutoff in case of overtemperature)
Controlling of the massage function

The tasks are subdivided as follows:

Reading in of signals
Evaluation of input factors
Actuation of components
Transmitting signals

Reading in of signals

The signals are read in by the multicontour seat control unit via the interior CAN (CAN B). The functions that use these signals are described in the individual function descriptions (see appropriate block diagram or function schematic).

Evaluation of input factors

The input factors read in are evaluated by the multicontour seat control unit. The air cushions of the contour inserts in the seat are actuated by the piezo valves integrated in the multicontour seat control unit.

Actuation of components

The driver multicontour seat control unit actuates the left front multicontour seat pneumatic pump (M25/8) via a direct line.

The front passenger multicontour seat control unit actuates the right front multicontour seat pneumatic pump (M25/9) via a direct line.

The respective multicontour seat control unit actuates the integrated piezo valves to inflate and deflate the air cushions in the contour insert in the seat.

Transmitting signals

The signals are transmitted via the following connections:

Left seat LIN (LIN B18), right seat LIN (LIN B19)
Interior CAN

Left seat LIN, right seat LIN

The driver multicontour seat control unit also sends the "massage action" and "massage intensity" requests via the left seat LIN to the driver massage function control unit (N32/31).

The front passenger multicontour seat control unit also sends the "massage action" and "massage intensity" requests via the right seat LIN to the front passenger massage function control unit (N32/32).

Interior CAN

The signals are transmitted by the multicontour seat control unit via the interior CAN. The functions that use these signals are described in the individual function descriptions (see appropriate block diagram or function schematic).

Variants

There are no hardware variants for the multicontour seat control unit. The assignment for driver or front passenger seat and the country or left-hand/right-hand drive vehicle assignment is also coded by the software.

Wiring diagram for multicontour seat control unit

PE91.25-P-2103-97NBA