Pneumatic pump for dynamic seat, component description - GF91.25-P-5204LE

MODEL 216.3, 221.0 /1 with CODE (432) Left and right dynamic multicontour seat as of model year 2009 /YoM 08 

Shown on model 221.0 model year 2009 / YoM 08 

Location 

The pneumatic pump for dynamic seat control is located under the reservoir on the left-hand side of the trunk in the direction of travel at the front of the trunk behind the trim.

Tasks 

• Compressed air supply of dynamic multicontour seat system
• Compressed air supply for retractable rear head restraints (RHR [KAF]) system (only vehicles without code (223) Rear bench seat with electrically adjustable outer seats with PRE-SAFE positioning function for outer seats and outer head restraints)
• Pressure monitoring of the reservoir by means of a sensor
• Compressed air supply solenoid switch on/off
• Leakage detection of pneumatic systems
• Automatic shut off of compressed air supply after 60 sec continuous operation of pneumatic pump for dynamic seat control
• Overpressure run of air-operated system, for draining compression moisture in composite pressure vessel through a pressure relief valve mounted on the container
• Actuation of the solenoid valve to expel compression moisture in the composite pressure vessel

These are grouped as follows:

• Reading in of sensors and signals 
• Evaluating input factors 
• Actuation of components 

Reading in of sensors and signals 

These input factors are read in via the following connections:

• Direct line 
• Interior CAN (CAN B) 

Direct line 

• Circuit 30
• Tml. 31

The following sensors are read in via direct internal lines:

• Pressure sensor in pneumatic pump for dynamic seat control

Interior CAN 

• Signals from left front dynamic seat control unit (N32/19)
• Signals from right front dynamic seat control unit (N32/22)
• Signals from EIS [EZS] control unit (N73)
• Signals from rear control unit (N22/6) (model 216 only)
• Signals from left rear door control unit (N69/3) (model 221 only)
• Signals from right rear door control unit (N69/4) (model 221 only)

Evaluation of input factors 

The read in input factors are evaluated by the pneumatic pump for dynamic seat control. Actuation of the electric motor in the pneumatic pump for dynamic seat control occurs accordingly.

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct internal line 

Direct internal line 

• Actuation of the solenoid valve to expel compression moisture in the composite pressure vessel

No components are actuated via the CAN bus by the pneumatic pump for dynamic seat control. Only information on further processing steps for other control units is sent to the interior CAN.

Variants 

• None

	Wiring diagram / rear SAM control unit with fuse and relay module (N10/2)	MODEL 221 Sheet 2	PE54.21-P-2108-99SAB
		Model 216 Sheet 2	PE54.21-P-2108-99CAB