Dynamic filling/emptying of air in the air cushions in the multicontour seat, function - GF91.25-P-2001S

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: 

Function sequence for dynamic lumbar support 

Function sequence 

First of all the three lumbar support air cushions of the multicontour backrest are emptied. After this the center air cushion is filled in stages up to the maximum pressure and then emptied again down to the minimum pressure (see Figure). This process (cycle) is repeated for a second time. After this the function is terminated by the control module. The function can be terminated at any time by pressing the switch again.

Lumbar support: curvature of spine in lumbar region

Dynamic lumbar support of multicontour backrest 

In order to prevent stresses in the back on longer journeys, the multicontour backrest is equipped with the dynamic lumbar support function. The function is controlled in the relevant seat by the multicontour backrest control module. It is triggered by pressing the dynamic lumbar support adjustment switch (S103s1/S104s1/S108s1/S109s1) in the left rear/right rear multicontour backrest switch group (S103, S104) and right front/left front multicontour backrest switch group (S108, S109)

Illustration shows: 

Function sequence of dynamic lumbar support as of 1.9.02 with codes 433 and 434 

Function sequence as of 1.9.02 with codes 433 and 434 

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

Dynamic lumbar support 

The function is controlled by the left front dynamic seat control module (N32/19). The program is started and stopped by the dynamic lumbar support adjustment switch (S109s1). The active function is displayed by illuminating the LED in the switch. After the switch is pressed, first the air pressures of the air cushion in the lumber support region are stored by the left front dynamic seat control module (N32/19.

Starting with the air cushion which is currently active the pulsation occurs alternately in the two lumbar support cushions in the sequence lower and upper lumbar (sequence is parameterizable). Filling starts with the active lumbar support cushion up to the next pressure level, unless the upper pressure level has already been reached or exceeded. Each air pressure adjustment is held for approx. 10 seconds before the next condition is assumed. After approx. 8 minutes the program is terminated automatically and the original air cushion pressures are reproduced.

	Multicontour seat switch, location/task/ design/function		GF91.25-P-2100S
	Multicontour seat control module, location/ task/design/function		GF91.25-P-2101S
	Dynamic seat switch, location/task		GF91.25-P-2110S
	Dynamic seat control module location/task		GF91.25-P-2105S