GF83.10-P-2000CW Ventilation System, Function
GF83.10-P-2000CW Ventilation System, Function
Air outlets in the passenger compartment
(shown on model 204.0 with code (581) Comfort automatic air conditioning)
Function
The ventilation system prevents windows from fogging up, supplies air to the vehicle occupants, and ensures that uniform and pleasant temperatures in the vehicle interior are reached quickly.
Function requirements:
^ Circuit 15 On
The electronic ignition lock control unit (N73) transmits the terminal status via the interior CAN.
Function sequence, general
The aeration is controlled with the aid of the blower motor (A32m1). When the fresh air/air recirculation flap is adjusted correspondingly, fresh air is supplied to the air conditioner housing via the air inlet.
The automatic air conditioning control and operating unit (N22/7) relays the request to the blower regulator (A32n1), which then actuates the blower motor.
With code (581) Comfort automatic air conditioning, ventilation of the rear compartment is also assisted by the rear blower motor (M2/1). Actuation is taken care of by the control and operating unit via the climate control LIN.
Depending on the current control and operating unit settings, the air is led into the vehicle interior via the air ducts and air outlets.
In order to prevent the windows from fogging up, the defroster flaps and the air recirculation flap are closed and the footwell flaps opened completely t = 2 minutes after circuit 15 has been switched off. After starting the engine, the defroster flaps and footwell flaps remain in this fixed position for 30 s. The air recirculation flap is immediately adjustable. All settings are then enabled again.
The following components are actuated by the control and operating unit via the climate control LIN to adjust the air flaps:
Vehicles with code (581) Comfort automatic air conditioning:
^ Fresh air/recirculated air flap actuator motor (M2/5)
^ Left blend air flap actuator (M2/6)
^ Right blend air flap actuator (M2/7)
^ Left defroster vent flap actuator motor (M2/8)
^ Right defroster vent flap actuator motor (M2/9)
^ Left footwell flap actuator motor (M2/10)
^ Right footwell flap actuator motor (M2/11)
^ Left center outlet flap actuator motor (M2/12)
^ Right center outlet flap actuator motor (M2/13)
^ Diffuser flap actuator motor (M2/21)
^ Ram air flap actuator motor (M2/34)
^ Rear blend air flap actuator motor (M2/35)
Vehicles without code (581) Comfort automatic air conditioning:
^ Fresh air/air recirculation flap actuator motor
^ Left blend air flap actuator
^ Right blend air flap actuator
^ Defroster vent flap actuator motor (M2/16)
^ Air distribution flap actuator motor (M16/22)
The ventilation function allows the following operating modes:
^ Fresh air mode
^ Air recirculation mode
^ Pollutant-controlled air recirculation mode
(with code (581) Comfort automatic air conditioning)
^ Defrost mode
^ Ram air operation
Fresh air mode function sequence
The fresh air/recirculated air flap is open and fresh air is delivered into the vehicle interior by the air conditioning housing.
Air recirculation mode function sequence
The fresh air/recirculated air flap is closed by briefly pressing the air recirculation mode button (N22/7s2) on the control and operating unit, which shuts of the outside air supply. The air only circulates in the vehicle interior and unpleasant odors and harmful gases are kept out. The LED in the air recirculation mode button lights up.
Pressing the air recirculation mode button for t > 1.5 s automatically closes the windows and the tilting/sliding roof (with code (414) Power glass tilting/sliding sunroof) or the panoramic sunroof (with code (413) Panoramic glass sunroof with top sliding sunroof).
Pressing the air recirculation mode button again returns the windows and the tilting/sliding roof or the panoramic sunroof to their previous positions.
The relevant message is transmitted to the following control units via the interior CAN:
^ Left front door control unit (N69/1
^ Right front door control unit (N69/2)
^ Left rear door control unit (N69/3)
^ Right rear door control unit (N69/4)
^ Overhead control panel control unit (N70) (with code (414) Power glass tilting/sliding sunroof)
^ Panoramic sliding roof control module (A98) (with code (413) Panoramic glass sunroof with top sliding sunroof)
These then close and open the windows, the tilting/sliding roof and the panoramic sunroof.
The detailed procedure is described in the convenience feature (CF) function.
Pollution-controlled air recirculation mode function sequence
The pollutant sensor (B31) transmits the outside air pollution values to the control and operating unit via the climate control LIN. The fresh air/recirculated air flap is automatically moved to the recirculated air position as of a certain pollutant concentration. The outside air supply is blocked and only interior air circulation takes place. If the condition for pollution-controlled air recirculation mode exists after the engine has been started, fresh air is supplied for t = 30 s.
Then 80 % pollution-controlled recirculated air is used, and after another t = 10 s 100 % pollution-controlled air is used if necessary. Pollution-controlled air recirculation mode is not indicated by a function LED.
Pollution-controlled air recirculation mode is possible with the following settings:
^ Refrigerant compressor (A9) switched off using the A/C button
^ Defrost mode active
Defrost mode function sequence
Pressing the defrost button causes all air flaps apart from the defroster flap and the air recirculation flap to be closed. These are opened all the way. The blend air flaps are all set to full warm air supply. The blower motor is actuated by the control and operating unit via the blower regulator in such a way that optimum defrosting is guaranteed, depending on the outflowing air temperature.
The refrigerant compressor is switched on in order to ensure that the outflowing air is dried.
With code (581) Comfort automatic air conditioning, separate defrosting is provided for the driver via the left defroster vent flap actuator motor and the front passenger via the right defroster vent flap actuator motor.
Without code (581) Comfort automatic air conditioning, defrosting is provided for both the driver and the front passenger via the defroster vent flap actuator motor.
Ram air operation function sequence
Ram air operation takes place depending on the vehicle speed.
Vehicles without code (581) Comfort automatic air conditioning:
Within a vehicle speed range of between v = 60 km/h and v = 160 km/h the fresh air/recirculated air flap is closed by the fresh air/recirculated air flap actuator motor in stages. At speeds of v > 160 km/h the fresh air/recirculated air flap is closed.
Vehicles with code (581) Comfort automatic air conditioning:
Within a vehicle speed range of between v = 60 km/h and v = 160 km/h the ram air flap is closed by the ram air flap actuator motor in stages. At speeds of v > 160 km/h the ram air flap is closed.
