GF83.40-P-3000FQA Automatic Air Conditioning Control and Operating Unit, Component Description
GF83.40-P-3000FQA Automatic Air Conditioning Control and Operating Unit, Component Description
MODEL 218
- except CODE (581) Comfort automatic air conditioning
Shown without code (494) USA version
N22/7 Automatic air conditioning control and operating unit
Shown with code (494) USA version
N22/7 Automatic air conditioning control and operating unit
Location
*The control and operating unit is located in the center console.
Design
The control and operating unit contains the following controls and displays:
- "AUTO" button (1)
- Defrosting button (2)
- "ZONE" button (3.1) (without code (494) USA version)
- "MAX COOL" button (3.2) (with code (494) USA version)
- "A/C" button (4)
- Right temperature selector wheel (5)
- Air distribution button (6)
- Increase air volume button (7)
- Reduce air volume button (8)
- "OFF" button (9)
- Left temperature selector wheel (10)
- Display (11)
- Rear window heater button (N22/7s1)
- Air recirculation mode button (N22/7s2)
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:
- Interior temperature selection separated for the left and right side
- Automatic blower control and air distribution
- Manual blower control and air distribution
- Switching the automatic air conditioning on and off
- Defrost function
- Switch refrigerant compressor (A9) on/off
- Mono mode
- Recirculated air mode
- Maximum cooling output (with code (494) USA version)
- Control of the rear window heater (R1)
It is operated with the following controls:
^ Button "OFF"
^ Temperature selector wheel
^ Air volume buttons
^ Air distribution button
^ "AUTO" button
^ "A/C" button
^ Rear window heater button
^ "ZONE" button (without code (494) USA version) Air recirculation mode button
^ Defrosting button
^ "MAX COOL" button (with code (494) USA version)
"OFF" button
The automatic air conditioning can be switched off completely or switched back on by pressing the "OFF" button.
Temperature selector wheel
Pressing the temperature rocker enables the required specified temperature to be set for the left and right sides. The temperature is shown on the display.
When the temperature is set to MAX, "HI" appears on the display, "LO" when the temperature is set to MIN
Air volume buttons
The air volume can be adjusted manually by actuating the air volume rocker.
The selected setting is shown on the display.
Air distribution button
The air volume can be adjusted by actuating the air volume rocker.
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 illuminates.
"A/C" button
Pressing the A/C button switches the refrigerant compressor on or off. All other functions are retained. The LED lights up when the refrigerant compressor is switched on.
The electronic ignition lock control unit (N73) sends the status of circuit 15 to the interior CAN (CAN B).
Rear window heater button
The rear window heater is switched on when the rear window heater button is pressed. The LED illuminates during operation.
The operating time of the rear window heater is calculated by the rear SAM control unit with fuse and relay module (N10/2) depending on the outside temperature, interior temperature and vehicle speed.
The detailed rear window heater procedure is described in the rear window heater (HHS) function description.
"ZONE" button (without code (494) USA version)
By pressing the "ZONE" button, the temperature values set for the driver side are adopted for the passenger side and the rear area.
The LED goes out when the function is activated.
If the temperature on the passenger side or in the rear is adjusted manually, the LED comes on, indicating the multizone temperature in the vehicle.
Air recirculation mode button
By actuating the air recirculation mode button for t < 1.5 s the fresh air/recirculated air flap is closed to prevent air from flowing in from outside. The air only circulates in the vehicle interior and unpleasant odors and harmful gases are kept out.
The LED above the air recirculation mode button is illuminated during operation.
Pressing the air recirculation mode button for t > 1.5 s activates comfort air recirculation closing.
The side windows and the tilting/sliding roof (SHD) (with code (414) Power glass tilting/sliding sunroof) are closed in the process. If the air recirculation mode button is pressed again for t > 1.5 s, the side windows and the tilting/sliding roof return to their previous positions.
Side windows or the tilting/sliding roof that were manually opened during the air recirculation phase do not return to their previous positions once the phase is over.
On vehicles with code (460) Canada version and code (494) USA version, comfort recirculation closing is not possible.
The detailed comfort air recirculation closing procedure is described in the convenience feature (CF [KFB]) function description.
Defrosting button
Pressing the defrosting button sets the temperature to "maximum" and distributes the air flow to the defroster vents. All the other flaps are closed. The blower output is regulated to match the coolant temperature.
When the function is activated, the LED illuminates.
"MAX COOL" button (with code (494) USA version)
Pressing the "MAX COOL" button causes the blower output to be raised to 100 % and the temperature set to "maximum cold". "MAX COOL" is shown 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
Direct line
The following sensors are read in via a direct line:
- Interior temperature sensor (B10/4)
- Evaporator temperature sensor (B10/6)
- Left side air outlet temperature sensor (B10/31)
- Right side air outlet temperature sensor (B10/32)
- Left front footwell air outlet temperature sensor (B10/35)
- Right front footwell vent air outlet temperature sensor (B10/36)
- Sun sensor (B32/3)
- Interior temperature sensor with integrated fan (N70/3b1) (without code (414) Electric glass tilting/sliding roof)
Climate control LIN
The following sensor is read in via climate control LIN:
- Vehicle interior humidity/temperature sensor (B82)
Interior CAN
The signals are read in 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).
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
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:
- 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)
- Defroster flap actuator motor (M2/16)
- Air distribution flap actuator motor (M16/22)
- PTC heater booster (R22/3) (with diesel engine)
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).
