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Multicontour seat (MCS), function - GF91.25-P-0001S

MODEL 220 with CODE (404b) Multicontour backrest driver seat 

MODEL 220 with CODE (405b) Multicontour backrest passenger seat 

MODEL 220 with CODE (224c) Electrically adjustable rear single seats, with seat ventilation, seat heater and memory package 

MODEL 220 with CODE (433) Left dynamic seat, incl. multicontour seat with CODE (434) Right dynamic seat, incl. multicontour seat 

Illustration shows: 

Multicontour seat (MCS) 

Fig 1: Identifying Two Air Cushions For Shoulder Region, Two Air Cushions For Side Region And Operating Switches
G04851605

Multicontour seat (MCS) 

The multicontour backrest of the multicontour seat enables individual adjustment of the seat backrest by filling and venting a total of seven air cushions. The contour and surface hardness of the seat backrest can be adjusted independently of each other. For this (combined into groups) two air cushions each are used for the shoulder region (1) and the side region (2), as well as three air cushions for the lumbar region (3). The filling and emptying of the individual air cushion groups is controlled either manually, by means of the operating switch (4) in the seat cushion frame of the respective seat, or automatically by means of the multicontour backrest control module, if the function of dynamic lumbar support has been performed.

The storage and calling up of seat backrest adjustments (air cushion pressure values) is possible with the memory feature.

IMPORTANT As of 1.6.01 the switch group has a different design. The modifications are shown in the document "Multicontour seat switch design".

Illustration shows: 

Dynamic seat (FDS) as of 1.9.02 with codes 433 and 434 

Fig 2: Identifying Air Cushion For Shoulder Region (Coupled) And Air Cushion For Respective Side Region
G04851606

Dynamic seat (FDS) as of 1.9.02 function with codes 433 and 434 

IMPORTANT All the following provisions for adjustment are explained on the driver's seat and also apply to the front passenger's seat.

The dynamic seat comprises the functions:

Memory multicontour backrest (MMKL) 

The multicontour backrests enable individual adjustment of the respective seat backrest by filling and emptying up to three air cushion groups:

The contour and surface hardness of the seat backrest can be adjusted manually via the:

Dynamic lateral support (driver's/front passenger's seat) 

Function requirements:

The "Dynamic lateral support" function is switched on or off by pressing the FDS button and is controlled by the left front dynamic seat control module (N32/19). If the function is activated, this is displayed by an LED in the FDS button. The left front dynamic seat control module (N32/19) adjusts after that a corresponding basic pressure in the lateral support cushions and, when cornering, ensures better retention in the lateral support by temporarily adding pressure to the lateral support cushions on the outside of the curve. This essentially happens as a function of the instantaneous speed and the lateral acceleration. This information comes from the traction systems control module (N47) and is transmitted by central gateway control module (N93) from CAN-C (engine compartment) to CAN-B (interior). If the data for the FDS function fail for more than 2 seconds, the function is switched off and remains switched off. The extent and speed with which the lateral support cushions for the driver's and front passenger's seat are filled can be adjusted via the second operating level of the instrument cluster (A1).

Sport (stage 1) 

Extra pressure is applied more quickly and more intensely to the lateral support cushions on the outside of the curve.

Comfort (stage 2) 

Extra pressure is applied slowly and less intensely to the lateral support cushions on the outside of the curve.

Definitively the following control modules are involved in the dynamic seat:

Priority sequence of the functions 

The priorities are set in the sequence:

When pressing multiple rocker switches at the same time, only the adjustment movement with the highest priority is executed.

Abort criteria 

All functions are interrupted if there is overvoltage or undervoltage.

The relevant function is not performed if a valve has overheated or there is a leakage fault.

Background functions 

In the lumbar support region the cushions are arranged overlapping and consequently coupled in their function during the wave sequence. As only one air cushion is active in each case, the adjacent cushions are considered as not active i.e. empty. The following background functions are necessary to ensure this.

Idle time emptying (optional) 

While the pressure is kept constant in the active air cushion (residence time), the adjacent non-active air cushions are emptied.

Backgrounds emptying 

If the active air cushion is emptied, then the residual pressure in the adjacent non-active air cushions is also reduced, as soon as the air cushions have the same pressure.

Limit stop emptying 

If the end point is reached after the lumbar support wave has passed, the inactive air cushion is emptied for as long as the switch is pressed, but for a maximum period of 1 minute.

Control functions 

The adjusted specified pressures of the individual cushion areas are controlled by the left front dynamic seat control module (N32/19) and right front dynamic seat control module (N32/22) in each case in a manner which is unnoticeable for the customer provided that the function conditions for manual adjustment are met.

The subsequent regulation follows, for example, in the event of pressure deviations caused by:

Sudden changes in pressure which arise due to the person sitting in on leaning on the seat are adjusted immediately and in a comfort-orientated manner. The control parameters that are listed can be programmed using diagnosis.

  Manual filling/emptying of air in the air cushions in the multicontour seat, function   GF91.25-P-2000S 
  Memory feature   GF91.25-P-2004S 
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