GF83.40-P-0005CE Automatic Air Conditioning, Function
GF83.40-P-0005CE Automatic Air Conditioning, Function
MODEL 204.0 /2 as of model year 2009 /YoM 08
MODEL 204.3
MODEL 204.9
A1 Instrument cluster
A2/56 Radio with auto pilot system (with code (511) Audio 50 APS with DVD changer)
A9 Refrigerant compressor (without code (B09) Refrigerant compressor with magnetic clutch)
A9/7 Refrigerant compressor with magnetic clutch (with code (B09) Refrigerant compressor with magnetic clutch)
A32m1 Blower motor
A32n1 Blower regulator
A40/3 COMAND controller unit (with code (512) COMAND APS incl. DVD changer or with code (527) COMAND APS with single DVD drive (with navigation))
A85 Left front door lock
A85s1 Left front door rotary tumbler switch
A85/1 Right front door lock
A85/1s1 Right front door rotary tumbler switch
A85/3 Left rear door lock
A85/3s1 Left rear door rotary tumbler switch (model 204.0/2/9)
A85/4 Right rear door lock
A85/4s1 Right rear door rotary tumbler switch (model 204.0/2/9)
A98 Panoramic sliding sunroof control module A2/56 Radio with auto pilot system (with code (413) Panoramic glass sunroof with top sliding sunroof)
B10/4 Interior temperature sensor
B10/6 Evaporator temperature sensor
B11/4 Coolant temperature sensor
B11/12 Dew point sensor (with code (581) Comfort automatic air conditioning, up to 31.5.10)
B12 Refrigerant pressure sensor
B14 Outside temperature sensor
B31 Pollutant sensor (with code (581) Comfort automatic air conditioning)
B32/3 Sun sensor
B82 Interior humidity/temperature sensor (as of 1.12.09)
M2/1 Rear blower motor (with code (581) Comfort automatic air conditioning)
M2/5 Fresh air/air recirculation flap actuator motor
M2/6 Left blend air flap actuator
M2/7 Right blend air flap actuator
M2/8 Left defroster flap actuator motor (with code (581) Comfort automatic air conditioning)
M2/9 Right defroster flap actuator motor (with code (581) Comfort automatic air conditioning)
M2/10 Left footwell flap actuator motor (with code (581) Comfort automatic air conditioning)
M2/11 Right footwell flap actuator motor (with code (581) Comfort automatic air conditioning)
M2/12 Left center air vent flap actuator motor (with code (581) Comfort automatic air conditioning)
M2/13 Right center air vent flap actuator motor (with code (581) Comfort automatic air conditioning or code (B03) ECO start/stop function)
M2/16 Defroster flap actuator motor (without code (581) Automatic air conditioning)
M2/21 Diffuser flap actuator motor (with code (581) Automatic air conditioning)
M2/34 Ram air flap actuator motor (with code (581) Comfort automatic air conditioning, in model 204.0/2 up to 31.5.10)
M2/35 Rear blend air flap actuator motor (with code (581) Automatic air conditioning)
M4/7 Combustion engine and air conditioning with integrated control fan motor
M13/5 Coolant circulation pump (with code (581) Comfort automatic air conditioning or code (B03) ECO start/stop function)
M16/22 Air distribution flap actuator motor (without code (581) Automatic air conditioning)
N3/9 CDI control unit (with diesel engine)
N3/10 ME-SFI [ME] control unit (with gasoline engine)
N10/1 Front SAM control unit with fuse and relay module
N10/2 Rear SAM control unit with fuse and relay module
N10/2kC Heated rear window relay
N22/4 Rear automatic air conditioning operating unit (with code (581) Comfort automatic air conditioning)
N22/7 Automatic air conditioning control and operating unit
N22/7s1 Rear window heater button
N22/7s2 Air recirculation mode button
N30/4 Electronic Stability Program control unit
N69/1 Left front door control unit
N69/2 Right front door control unit
N69/3 Left rear door control unit (model 204.0/2/9)
N69/4 Right rear door control unit (model 204.0/2/9)
N70 Overhead control panel control unit (model 204.0/2 with code (414) Power glass tilting/sliding roof)
N70b1 Interior temperature sensor with integrated fan (model 204.0/2 with code (414) Power glass tilting/sliding roof)
N70/3 Electronic overhead control panel (model 204.0/2 without code (414) Power glass tilting/ sliding roof, model 204.3/9)
N70/3b1 Interior temperature sensor with integrated fan (model 204.0/2 without code (414) Power glass tilting/sliding roof, model 204.3/9)
N73 Electronic ignition switch control unit
R1 Rear window defroster
R22/3 PTC heater booster (for diesel engine)
A Without code (581) Comfort automatic air conditioning
B With code (581) Comfort automatic air conditioning
CAN B Interior CAN
CAN E Chassis CAN
LIN B8 Climate control LIN
Function requirements, general
^ Control functions: circuit 15
^ Climate control: Engine running
The electronic ignition lock control unit transmits the status of circuit 15 over the interior CAN. The "Engine running" signal is sent by the CDI control unit or from the ME-SFI [ME] control unit over the chassis CAN and forwarded by the front SAM control unit over the interior CAN to the control and operating unit.
Automatic air conditioning, general
Two different automatic air conditioning versions are installed:
- Automatic air conditioning with 2-zone temperature control (without code (581) comfort automatic air conditioning )
- Automatic air conditioning with 3-zone temperature control (with code (581) Comfort automatic air conditioning)
Regulation and control are performed in each case by the control and operating unit.
The automatic air conditioning without code (581) Comfort automatic air conditioning is equipped with a separate temperature control for the left and the right half of the vehicle.
Blower control takes place with 1 zone and can be operated manually or controlled automatically.
The automatic air conditioning with code (581) Comfort automatic air conditioning is equipped with a separate temperature control for the left and the right half of the vehicle and for the rear compartment. The front blower control can be manually or automatically operated. Manual operation is only possible in the rear using a separate rear automatic air conditioning operating unit.
The blower is controlled in 2 zones (front and rear)
The automatic air conditioning encompasses the following subfunctions:
^ Heating circuit function sequence
^ Function sequence for residual engine heat utilization (with code (581) Comfort automatic air conditioning without code (494) USA version)
Further subfunctions are described in separate documents:
^ Automatic air conditioning refrigerant circuit, function
^ Ventilation system, function
^ Regulation of Automatic air conditioning, function
^ Heated rear window, function
Heating circuit function sequence
Driven by the coolant pump, the coolant circulates in the engine cooling circuit. In the process, it absorbs engine heat. The heated coolant passes through the heater heat exchanger, which dissipates heat to the air blowing by.
At low engine speed or when the engine is stopped (with code (B03) ECO start/stop function) the coolant circulation pump (with code (581) Comfort automatic air conditioning or code (B03) ECO start/stop function) is actuated to ensure that there is a sufficiently high flow rate to heat the blowby air.
The coolant circulation pump is actuated by the front SAM control unit on request of the control and operating unit.
Function sequence for residual engine heat utilization (with code (581) Comfort automatic air conditioning without code (494) USA version)
Pressing the REST button on the control and operating unit switches on the residual engine heat utilization function. The control and operating unit sends the request via interior CAN to the front SAM control unit, which directly actuates the coolant circulation pump. The coolant circulation pump delivers the still warm (residual heat) coolant through the heat exchanger.
At the same time, the control and operating unit sends the ventilation request to the blower regulator, which then actuates the blower motor at reduced power. The air drawn in by the blower motor is routed along the heater heat exchanger and thus heated up.
The function is terminated after a specified fixed time or when the on-board power supply voltage drops below a certain value.
