GF83.40-P-3000CEB Automatic Air Conditioning Control and Operating Unit, Component Description
GF83.40-P-3000CEB Automatic Air Conditioning Control and Operating Unit, Component Description
MODEL 204.0 /2
- with CODE (581) Comfort automatic air conditioning as of model year 2009 /YoM 08
MODEL 204.9
- with CODE (581) Comfort automatic air conditioning
Model 204.0/2 up to 28.2.11, model 204.9 except code (494) USA version
1 Left temperature selector wheel
2 "AUTO" button
3 Button "OFF"
4 "MONO" button
5 "A/C" button
6 REST button
7 Right temperature selector wheel
8 Defrosting button
9 Right air distribution button
10 Increase air volume button
11 Reduce air volume button
12 Display
13 Left air distribution button
N22/7 Automatic air conditioning control and operating unit
N22/7s1 Rear window heater button
N22/7s2 Air recirculation mode button
n vehicles with code (494) USA version, the "MAX A/C" button is installed instead of the "MONO" button.
Model 204.0/2 as of 1.3.11
1 Left temperature selector wheel
2 "AUTO" button
3 Button "OFF"
4.1 "ZONE" button
5 "A/C" button
6 REST button
7 Right temperature selector wheel
8 Defrosting button
9.1 Air distribution button
10 Increase air volume button
11 Reduce air volume button
12 Display
13.1 "AIR FLOW" button
N22/7 Automatic air conditioning control and operating unit
N22/7s1 Rear window heater button
N22/7s2 Air recirculation mode button
Location
The automatic air conditioning control and operating unit is located in the instrument panel.
Task
The automatic air conditioning control and operating unit performs the following tasks:
^ Operation of the vehicle's climate control
^ Reading in of sensors and signals
^ Evaluation of input factors
^ Actuation of components
Operation of the vehicle's climate control
The automatic air conditioning control unit is the master control unit for the climate control of the vehicle interior and controls or regulates the following functions:
- Interior temperature selection separated for the left and right sides of vehicle
- Automatic blower control and air distribution
- Manual blower control and air distribution
- Switch automatic air conditioning (AAC [KLA]) on and off
- Defrost
- Switch refrigerant compressor ON/OFF (A9) (without code (B09) Refrigerant compressor with magnetic clutch) or refrigerant compressor with magnetic clutch (A9/7) (with code (B09) Refrigerant compressor with magnetic clutch)
- Mono mode (except code (494) USA version)
- Recirculated air mode
- Maximum cooling output
- Residual engine heat utilization system (except code (494) USA version)
- Control of the rear window heater (R1)
The functions are operated using the following controls on the automatic air conditioning control and operating unit:
^ Button "OFF"
^ Temperature selector wheels
^ Air volume buttons
^ Air distribution buttons (model 204.0/2 up to 28.2.11, model 204.9)
^ Air distribution button (model 204.0/2 as of 1.3.11)
^ "AUTO" button
^ "A/C" button
^ Rear window heater button
^ "MONO" button (model 204.0/2 up to 28.2.11, model 204.9 except code (494) USA version)
^ "ZONE" button (model 204.0/2 as of 1.3.11)
^ Air recirculation mode button
^ Defrosting button
^ "REST" button (except code (494) USA version)
^ "MAX A/C" button (with code (494) USA version)
^ "AIR FLOW" button (model 204.0/2 as of 1.3.11)
Button "OFF"
The AAC [KLA] can be switched off completely or switched back on by pressing the "OFF" button.
Temperature selector wheels
The desired temperature setting for the left and right vehicle sides can be set by turning the associated temperature selector wheel.
The selected specified temperature is displayed via light-emitting diodes (LED) of each temperature selector wheel.
With the temperature set to maximum, "HI" appears in the display; with the temperature set to minimum, "LO" appears in the display.
Air volume buttons
Pressing the respective air volume button enables the air volume to be manually selected.
The selected setting is shown on the display.
Air distribution buttons (model 204.0/2 up to 28.2.11, model 204.9)
The respective air distribution can be manually set for the left or right side using the air distribution buttons.
The selected air distribution setting is shown on the display.
Air distribution button (model 204.0/2 as of 1.3.11)
The air distribution button can be used to manually adjust the air distribution.
The selected air distribution setting is shown on the display.
"AUTO" button
The air volume and the air distribution are controlled automatically when the "AUTO" button is pressed. If automatic mode is activated, the LED in the "AUTO" button lights up.
Adjust air volume or air distribution manually to deactivate automatic function.
"A/C" button
Pressing the "A/C" button switches the refrigerant compressor on or off. All other functions are retained.
The LED in the "A/C" button lights up when the refrigerant compressor is switched on.
Rear window heater button
The rear window heater is switched on when the rear window heater button is pressed. The LED in the rear window heater button lights up during operation.
"MONO" button (model 204.0/2/ up to 28.2.11, model 204.9 except code (494) USA version)
By pressing the "MONO" button, the values for air distribution and temperature set on the driver side are adopted for the passenger side.
"ZONE" button (model 204.0/2 as of 1.3.11)
By pressing the "ZONE" button, the values for air distribution and temperature set on the driver side are adopted for the passenger side.
Air recirculation mode button
Briefly operating the air recirculation mode button prevents air entering from outside. The LED in the air recirculation mode button lights up during operation.
If pressed longer, the comfort air recirculation closing is activated.
The side windows and the tilting/sliding roof (with code (414) Power glass tilting/sliding roof) or the panoramic sliding sunroof (with code (413) Panoramic glass sunroof with top sliding sunroof) are then closed or opened as a consequence.
On vehicles with code (460) Canada version or code (494) USA version, the comfort recirculation closing function is not possible.
The detailed convenience recirculation closing procedure is described in the convenience feature function (KFB).
Defrosting button
Pressing the defrosting button sets the temperature to "maximum" and distributes the air flow to the defroster vents. The air recirculation flap remains open. All other flaps of the air conditioner housing are closed.
The blower output is regulated to match the coolant temperature.
The LED in the defrosting button lights up during operation.
"REST" button (except code (494) USA version)
Operating the "REST" button activates the residual engine heat utilization function. If the function is activated, the LED in the "REST" button lights up.
"MAX A/C" button (with code (494) USA version)
Pressing the "MAX A/C" button causes the blower output to be raised to 100 % and the temperature set to "maximum cold".
"AIR FLOW" button (model 204.0/2 as of 1.3.11, model 204.9 as of 1.6.12)
Pressing the "AIR FLOW" button enables the desired ventilation mode to be selected. The selected mode is indicated on the display.
Reading in of sensors and signals
The input factors are read in via the following connections:
^ Direct line
^ Climate control LIN (LIN B8)
^ Interior CAN (CAN B)
Direct line
The signals from the following components are read via a direct line:
- Interior temperature sensor (B10/4)
- Evaporator temperature sensor (B10/6)
- Sun sensor (B32/3)
- Interior temperature sensor with integrated fan (N70/3b1) (model 204.0/2 without code (414) Power glass tilting/sliding roof, model 204.9)
Climate control LIN
The signals of the following components are read in via climate control LIN:
- Dew point sensor (B11/12)(upto31.5.10)
- Rear automatic air conditioning operating unit (N22/4)
- Interior humidity/temperature sensor (B82) (as of 1.12.09)
- Emissions sensor (B31)
Interior CAN
The following signals are read in over the interior CAN:
- Provided by the instrument cluster (A1):
- Vehicle speed
- Provided by the radio with auto pilot system (A2/56) (with code (511) Audio 50 APS with DVD changer) or by COMAND controller unit (A40/3) (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation)):
- Voice control system (VCS) status
- Provided by the front SAM control unit with fuse and relay module (N10/1):
- Coolant temperature sensor (B11/4)
- Refrigerant pressure sensor (B12)
- Outside temperature sensor (B14)
- Engine speed
- Provided by the overhead control panel control unit (N70):
- Interior temperature sensor with integrated fan (N70b1) (model 204.0/2 with code (414) Power glass tilting/sliding roof)
- Provided by the electronic ignition lock control unit (N73):
- Status of circuit 15
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Actuation of components
The actuation of the components takes place via the following connections:
^ Direct line
^ Climate control LIN
^ Interior CAN
Direct line
The following component is actuated via a direct line:
- Blower regulator (A32n1)
Climate control LIN
The following components are actuated via climate control LIN:
- Rear blower motor (M2/1)
- Fresh air/recirculated air flap actuator motor (M2/5)
- Left blend air flap actuator motor (M2/6)
- Right blend air flap actuator motor (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 air vent flap actuator motor (M2/12)
- Right center air vent flap actuator motor (M2/13)
- Diffuser flap actuator motor (M2/21)
- Ram air flap actuator motor (M2/34) (in model 204.0/2 up to 31.5.10)
- Rear blend air flap actuator motor (M2/35)
- PTC heater booster (R22/3) (with engine 646.8, 642.9 or 651.9)
Interior CAN
The signals are transmitted by the control and operating unit via the interior CAN.
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
