Active multicontour seat control unit component description - GF91.25-P-5220FQ
MODEL 218 with CODE 432 (Active multicontour seat)
For vehicles with code (494) USA version only the driver seat is an active multicontour seat.
Location
The active multicontour seat control unit is located in the center of the front seat backrest frame.
Tasks
The active multicontour seat control unit has the following tasks:
- Inflation and deflation of the multicontour seat air cushions
- Control of the massage function
- Control of the dynamic lateral support
- Reading in voltage-coded signals from the driver active multicontour seat button group (S109) or the front passenger active multicontour seat button group (S108)
- Communication with other control units through interior CAN (CAN B)
- Adjustment of stored pressure values when memory function and storage of actual contours (with code (275) Memory package (electrically adjustable front seats)
- Function monitoring
The tasks are subdivided as follows:
- Reading in of sensors and signals
- Evaluation of input factors
- Actuation of components
Reading in of sensors and signals
The input factors are read in via the following connections:
- Direct line
- Interior CAN
Direct line
The signals of the following components are read in by the respective active multicontour seat control unit via direct lines:
- Driver active multicontour seat button group
- Front passenger active multicontour seat button group
- Limit switch in the left front massage function actuator motor (M94)
- Limit switch in the right front massage function actuator motor (M95)
Interior CAN
The active multicontour seat control units communicate via interior CAN with the following control units:
- Driver seat control unit (N32/1) or front passenger seat control unit (N32/2) (adjustment and storage of seat contours) (with code (275) Memory package for electrically adjustable front seats)
- Active multicontour seat pneumatic pump (M40/1) (control of the compressed air supply)
- Front SAM control unit with fuse and relay module (N10/1) as Gateway for the dynamic and PRE-SAFE® function
Evaluation of input factors
The input factors that are read in are evaluated by the active multicontour seat control unit and the relevant components are actuated.
Actuation of components
The actuation of the components takes place via the following connections:
- Direct line
- Interior CAN
Direct line
The following components are actuated by the respective active multicontour seat control unit via direct lines:
- LED in the active multicontour seat button group (function feedback)
- Front seat massage function actuator motor
- Main valve in front seat massage function actuator motor
The air cushions in the seats are inflated and deflated using the piezo valves integrated in the active multicontour seat control units. The rows of air cushions in the massage insert are actuated by the relevant front seat massage function actuator motor under the control of the respective active multicontour seat control unit.
Interior CAN
The active multicontour seat control units communicate via interior CAN with the active multicontour seat pneumatic pump for controlling the compressed air supply.
Body
Pressure sensors and piezo valves are integrated in the active multicontour seat control units.
| Active multicontour seat control unit wiring diagram | PE91.29-P-2112-97XAA |