Multicontour Seat, Basic Function - GF91.25-P-9900A
MODEL ALL (CAR) with CODE 399 (Multicontour front seats with massage function)
MODEL ALL (CAR) with CODE 409 (Left/right front multicontour seat)
Overview:
This document contains information on:
- General
- Function requirements
- Pressure setting of air cushions, function
- Simplified massage function (with code 409 (Left/right front multicontour seats)), function
- Massage function (with code 399 (Front multicontour seats with massage function)), function
- Actuation by other systems, function
General
The multicontour seat enables adjustment of the seat backrest padding by means of independently inflatable air cushions. The multicontour seat thus enables individual contour adjustment of the seat backrest to the vehicle occupants.
The following air cushions are installed in the multicontour seat:
- Left and right seat side bolsters of the backrest
- In the upper lumbar area
- In the lower lumbar support area
In addition, equipment-dependent massage and/or dynamic functions are available on the multicontour seat.
Function requirements
- Circuit 15 or circuit 15R ON
- No on-board electrical system limp-home mode
Pressure setting of air cushions, function
The adjustment of air cushions is performed via the multimedia system. The multicontour seat pneumatic pump provides the air supply that is required to inflate the air cushions.
The distribution of air supply is performed via integrated valves in the multicontour seat control unit.
The air cushions in the side bolsters are actuated in parallel by an integrated valve.
Pressure setting of the air cushions takes place in 2 phases:
- Short-term control: Short-term control compensates for overpressure deviations in the air cushions. It activates following every adjustment procedure and only remains active for a short parameterizable period of time. This function is used among others to compensate for sitting down or leaning back immediately and in a comfort-oriented fashion.
- Long-term control: After the short-term control, the long-term control becomes active. The long-term control function regulates the pressure supply such that the specified pressure is always achieved. This is done almost without the driver or front passenger noticing.
Adjustment of the air cushions is canceled under the following conditions:
- Overvoltage or undervoltage
- Inflating or deflating timeout
- Leak in one or more air cushions
Simplified massage function (with code 409 (Left/right front multicontour seats)), function
In order to implement the massage function, the multicontour seat control unit actuates the air cushions in the lumbar area with a pulsating/undulating inflation and deflation action. This provides a massage effect in the lumbar spine area.
The multicontour seat pneumatic pump provides the air supply that is required to inflate the air cushions. The respective multicontour seat control unit controls the air supply to the air cushions via the integrated valves and thus implements the massage function.
The respective multicontour seat control unit stores the current specified pressure of the air cushions when the function is started. At the end of the massage, the multicontour seat control unit restores the previously stored specified pressures.
The massage function is operated via the multimedia system.
Massage function (with code 399 (Front multicontour seats with massage function)), function
To implement the different massage programs, each seat backrest has 14 and each seat cushion has four individual massage bladders located in them. The massage function inflates and deflates these independently of each other.
The multicontour seat pneumatic pump provides the air supply that is required to inflate the massage bladders. The respective massage function control unit controls the air supply to the massage bladders via the integrated valves and therefore implements the selected massage program.
The massage function is operated via the multimedia system.
The following massage programs are available:
- "Hot relaxing massage for back"
- "Hot relaxing massage for shoulders"
- "Activating massage"
- "Classic massage"
- "Undulating massage"
- "Mobilizing massage"
- "Active backrest workout"
- "Active cushion workout"
With the massage programs "hot relaxing massage for back" and "hot relaxing massage for shoulders", the seat heating also switches on the seat backrest heater.
The massage function is interrupted when the following settings are made:
- Manual adjustment of air cushions
- Memory adjustment request
After the interruption, the massage starts in its sequential control system with the next upcoming massage step.
The massage function is canceled under the following conditions:
- Overvoltage or undervoltage
- Adjustment request via PRE-SAFE®
Actuation by other systems, function
The multicontour seats can also be actuated by the following systems:
- Revitalization
- Preventive occupant protection system
| Control units | |||
|---|---|---|---|
| Multicontour seat control unit, basic function | GF91.25-P-9890A |