Component description for automatic air conditioning control and operating unit - GF83.40-P-3000CEB

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 

Shown up to 28.2.11 except code (494) USA version 

On vehicles with code (494) USA version, the "MAX A/C" button is installed instead of the "MONO" button.

Shown as of 1.3.11 except code (494) USA version 

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
• Switching on and off of the refrigerant compressor (A9) (without model 204.002/202, and in vehicles for the Economic Commission for Europe (ECE) up to 28.2.11) or the refrigerant compressor with magnetic clutch (A9/7) (model 204.002/202 as of 1.6.10, and in vehicles for the Economic Commission for Europe (ECE) as of 1.3.11)
• 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:

• "OFF" button 
• Temperature selector wheels 
• Air volume buttons 
• Air distribution buttons (up to 28.2.11) 
• Air distribution button (as of 1.3.11) 
• "AUTO" button 
• "A/C" button 
• Rear window heater button 
• "MONO" button (up to 28.2.11 except code (494) USA version) 
• "ZONE" button (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 (as of 1.3.11) 

"OFF" button 

The AAC [KLA] can be switched off completely or switched back on by pressing the "OFF" button.

Temperature selector wheels 

The desired specified temperature for the left and right sides of the vehicle can be set by turning the temperature selector wheel. The selected specified temperature is displayed via light-emitting diodes (LED) of the 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 (up to 28.2.11) 

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 (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 regulated 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 (up to 28.2.11 except code (494) USA version) 

When the "MONO" button is pressed, the values for air distribution and temperature set on the driver side are adopted for the passenger side.

"ZONE" button (as of 1.3.11) 

When the "ZONE" button is pressed, 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) Electric 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) 

Pressing 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) 

Press the "MAX A/C" button to raise the basic ventilation to the maximum value P = 100%. "MAX COOL" is shown on the display.

"AIR FLOW" button (as of 1.3.11) 

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 sensors are read in via climate control LIN:

• Dew point sensor (B11/12) (up to 31.5.10)
• 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 instrument cluster (A1):
  • Vehicle speed
• provided by radio with autopilot system (A2/56) (with code (511) Audio 50 APS incl. DVD changer) or COMAND controller unit (A40/3) (with code (512) COMAND APS incl. DVD changer or with code (527) COMAND APS with single DVD drive (with navigation)):
  • Status of voice control system (VCS [SBS])
• 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):
  • Terminal status 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), (with 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 following components are actuated over the interior CAN:

• By the front SAM control unit:
• Refrigerant compressor control valve
• Refrigerant compressor with magnetic clutch (model 204.002/202 as of 1.6.10, and in vehicles for the Economic Commission for Europe (ECE) as of 1.3.11)
• By the left front door control unit (N69/1):
  • Left front door power window motor (M10/3)
• By the left front door control unit (N69/2):
  • Right front door power window motor (M10/4)
• By the overhead control panel control unit:
  • Tilting/sliding roof motor (M12m1) (with code (414) Electric glass tilting/sliding roof)
• By the panoramic sliding sunroof control module (A98) (with code (413) Panoramic glass sunroof with top sliding sunroof):
  • Panoramic sliding roof motor (A98m1)

With model 204.0/2/9:

• By the left rear door control unit (N69/3):
  • Left rear door power window motor (M10/5)
• By the left rear door control unit (N69/4):
  • Right rear door power window motor (M10/6)

	Wiring diagram for automatic air conditioning (AAC) control unit	Sheet 1, connector 1	PE83.40-P-2101-97FAB
		Sheet 2, connectors 2 and 3	PE83.40-P-2101-97FAC