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

MODEL 164.1 as of model year 2009 except CODE (581) Comfort automatic air conditioning/YoM 08 model refinement package 

MODEL 164.8, 251.0/1 as of model year 2009 except CODE (581) Comfort automatic air conditioning/YoM 08 

Shown on model 251 without code (494) USA version 

Location 

The control and operating unit is located in the center console.

Shown on model 251 with code (494) USA version 

Location 

The control and operating unit is located in the center console.

Design 

The control and operating unit contains the following controls and displays:

• Left temperature selector wheel (1)
• "AUTO" button (2)
• Defrosting button (3)
• Increase air volume button (4)
• Windshield air distribution button (5)
• "A/C", "REST" button (6)
• Right temperature selector wheel (7)
• "REAR" button (8)
• Center air distribution button (9)
• Footwell air distribution button (10)
• Air volume indicator (11)
• Reduce air volume button (12)
• "OFF" button (13)
• In-car temperature sensor (N22b1)
• Heated rear window switch (N22s1)
• Air recirculation switch (N22s2)

Task 

The control and operating unit has 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 control and operating unit enables the following operations:

• Switching the automatic air conditioning on and off
• Interior temperature selection separated for the left and right side
• Manual blower control and air distribution
• Automatic blower control and air distribution
• Defrost function
• Residual heat utilization
• Recirculated air mode
• Heated rear window (R1) actuation

It is operated with the following controls:

• Temperature selector wheels 
• "AUTO" button 
• Defrosting button 
• Air volume buttons 
• Air distribution buttons 
• "A/C", "REST" button 
• "REAR" button 
• "OFF" button 
• Heated rear window switch 
• Air recirculation switch 

Temperature selector wheels 

The desired temperature setting for the left and right sides can be set by turning the associated temperature selector wheel.

The selected specified temperature is displayed via LEDs at the border of the temperature selector wheel.

"AUTO" button 

The air volume and the air distribution are regulated automatically when the AUTO button is pressed. If the automatic operation is activated, the LED in the "AUTO" button lights up.

The blower level on the USA version is higher than on the Economic Commission for Europe (ECE) version.

Defrosting button 

Pressing the defroster button sets the temperature to "maximum" and the air flow is distributed to the defroster and side air vents. All the other flaps are closed. The blower output is regulated to match the coolant temperature.

If the function is activated, the light emitting diode in the defroster button illuminates.

Air volume buttons 

Pressing the respective air volume button enables the air volume delivered to the interior to be set manually.

The selected setting is displayed in the air volume display.

Air distribution buttons 

Pressing the respective air distribution button enables the distribution of the air flowing into the interior to be set manually.

If the function is activated, the LED in the respective air distribution button lights up.

"A/C", "REST" button 

With circuit 15 ON, press the "A/C", "REST" button to switch the refrigerant compressor (A9) (not on model 164.195) or the electric refrigerant compressor control unit (N19/4) (on model 164.195) on or off. All other functions are retained.

The LED in the "A/C", "REST" button lights up with the refrigerant compressor switched on.

With circuit 15C or circuit 15R ON, press the "A/C", "REST" button to activate the residual engine heat utilization system function. When the function is activated, the LED illuminates.

"REAR" button 

The "REAR" button can be used to change the rear temperature values via the control and operating unit. When the REAR button is pressed, the specified rear temperature values appear in the right temperature selector wheel. The blower setting is not visible.

The function is stopped automatically if operation is not performed within approx. t = 5 s or the "REAR" button is pressed again.

During operation with the remote control, an adjustment of the specified values in the rear is not possible.

The rear values are stored in the control and operating unit.

With code (494) USA version, the "REAR" button is provided with the lettering "REAR" instead of a pictogram.

"OFF" button 

The automatic air conditioning can be switched off completely or switched back on by pressing the "OFF" button.

The LED in the "OFF" button lights up when the automatic air conditioning is switched off.

Rear window heater switch 

The rear window heater is switched on when the rear window heater switch is pressed. The LED lights up during operation of the rear window heater.

The operating time of the rear window heater is calculated by the rear SAM control unit (N10/8) depending on the outside temperature and the vehicle speed.

Air recirculation switch 

When the air recirculation switch on the control and operating unit is pressed for t < 1.5 s, the fresh air/air recirculation flap is closed, and thus the supply of outside air is prevented. The air only circulates in the vehicle interior and unpleasant odors and harmful gases are kept out. The LED in the air recirculation switch comes on.

Pressing the air recirculation switch for t > 1.5 s activates comfort recirculation closing. In the process the windows, the tilting/sliding roof (with code (414) Power glass tilting/sliding roof) or the panoramic sunroof (model 251 with code (413) Panoramic glass sunroof with top sliding sunroof) and the vent windows (model 164.8 and model 251 with code (848) Power side vent windows) are closed automatically.

When the air recirculation switch is pressed again for t > 1.5 s, the windows, the tilting/sliding roof or the panoramic sunroof and the vent windows return to the previous positions.

With code (460) Canada version and code (494) USA version, convenience recirculation closing is not possible.

The detailed convenience recirculation closing procedure is described in the convenience feature function (KFB).

Reading in of sensors and signals 

The input factors are read in with the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following sensors are read in via a direct line:

• Interior air temperature sensor
• Evaporator temperature sensor (B10/6)
• Left side outlet temperature sensor (B10/31)
• Right side outlet temperature sensor (B10/32)
• Left center outlet temperature sensor (B10/33)
• Right center outlet temperature sensor (B10/34)
• Left footwell temperature sensor (B10/35)
• Right footwell temperature sensor (B10/36)
• Refrigerant pressure sensor (B12)
• Outside temperature indicator temperature sensor (B14)
• Sun sensor (B32)

Interior CAN 

The following signals and sensors are read in via interior CAN:

By the instrument cluster (A1):

• Ground speed

By the rear SAM control unit:

• Rear door locking unit (A72)
• Right front door rotary tumbler microswitch (M14/5s1)
• Left front door rotary tumbler microswitch (M14/6s1)
• Left rear door rotary tumbler microswitch (M14/8s1)
• Right rear door rotary tumbler microswitch (M14/9s1)
• Left vent window motor (M21/8)

  (on model 164.8 and on model 251.0/1 with code (848) Power side vent windows)

• Right vent window motor (M21/9)

  (on model 164.8 and on model 251.0/1 with code (848) Power side vent windows)

By the left front door control unit (N69/1), right front door control unit (N69/2) and front SAM control unit (N10):

• Window position

From the overhead control panel control unit (N70):

• Tilting/sliding roof position (with code (414) Electric glass tilting/sliding roof)
• Panoramic roof position (with code (413) Panoramic glass sunroof with top sliding sunroof)

From the electronic ignition switch control unit (N73)

• Terminal 15

By the central gateway control unit (N93):

• Coolant temperature sensor (B11/4)

• Engine speed

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

Actuation of components 

Components are actuated with the following lines:

• Direct line 
• Climate control LIN 
• Interior CAN 

Direct line 

The following components are actuated:

• Control valve of the refrigerant compressor (not on model 164.195)
• Coolant circulation pump (M13)
• High-voltage battery cooling system shutoff valve (Y19/1)

  (on model 164.195)

• Front evaporator shutoff valve (Y19/3)

  (on model 164.195)

Climate control LIN 

The following components are actuated via climate control LIN:

• Blower regulator (A32n1)
• Fresh air/air recirculation flaps actuator motor (M2/5)
• Left blend air flap actuator motor (M2/6)
• Right blend air flap actuator motor (M2/7)
• Rear shutoff flap actuator motor (M2/12)
• Footwell flap actuator motors left and right (M2/15)
• Defroster vent flap actuator motors left and right (M2/16)
• Rear air distribution flap actuator motor (M2/21)
• Center air outlet flap actuator motor (M2/22)
• PTC heater booster (R22/3) (with diesel engine)

Interior CAN 

The following components are actuated with the interior CAN:

By the rear SAM control unit:

• Rear window defroster

By the central gateway control unit:

• AAC with integrated control additional fan motor (M4/7)

From the left front door control unit:

• Left front power window motor (M10/3)

From the right front door control unit:

• Right front power window motor (M10/4)

By the front SAM control unit:

• Left rear power window motor (M10/5)
• Right rear power window motor (M10/6)

By the rear SAM control unit on model 164.8 and model 251.0/1 with code (848) Electric side vent window:

• Left vent window motor
• Right vent window motor

By the overhead control panel control unit with code (414) Power glass tilting/sliding sunroof:

• SR motor (M12m1),

For code (413) Panoramic glass roof with top sliding roof:

• Roller sun blind drive unit (M12/5)
• Panoramic sliding sunroof drive unit 1 (M12/6)
• Panoramic sliding sunroof drive unit 2 (M12/7)

On model 164.195:

via the central gateway control unit and via engine compartment CAN (CAN C):

• Electric refrigerant compressor control unit

	Wiring diagram for automatic air conditioning (AAC) control unit	Model 164	PE83.40-P-2101-97MAA
		Model 251	PE83.40-P-2101-97RAA