GF83.40-P-3000FLA Component Description For Automatic Air Conditioning Control and Operating Unit

GF83.40-P-3000FLA Component Description For Automatic Air Conditioning Control And Operating Unit
- except CODE (581) Comfort automatic air conditioning

Component Identification:

Location
The control and operating unit is located in the instrument panel.

Design
The control and operating unit contains the following controls and displays:
- Defroster button
- "ZONE" button
- "AUTO" button
- "A/C" button (without code (965) Electrical preinstallation for rental vehicle)
- "OFF" button
- Display
- Right temperature rocker
- Air distribution rocker
- Air volume rocker
- Left temperature rocker
- "MAX COOL" button (with code (494) USA version)
- Rear window heater button
- Air recirculation mode button

With code (965) Electrical preinstallation for rental vehicle, the residual engine heat utilization function is also present. Instead of the "A/C" button, the "A/C, REST" button is installed.

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
- Switching the A/C compressor (A9) on and off
- Mono mode
- Recirculated air mode
- Maximum cooling output (with code (494) USA version)
- Residual engine heat utilization system (with code (965) Electrical preinstallation for rental vehicle)
- Control of the rear window heater (R1)

It is operated with the following buttons:
^ "OFF" button
^ Temperature rocker
^ Air volume rocker
^ Air distribution rocker
^ "AUTO" button
^ "A/C" button (without code (965)
^ Electrical preinstallation for rental vehicle)
^ "A/C, REST" button (with code (965) Electrical preinstallation for rental vehicle)
^ Rear window heater button
^ "ZONE" button
^ 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 rocker
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.

With the temperature set to the maximum, the "HI" indication appears in the display and with the temperature set to the minimum, the "LO" indication appears in the display.

Air volume rocker
The air volume can be adjusted manually by actuating the air volume rocker. The selected setting is shown on the display.

Air distribution rocker
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 the automatic mode is activated, the light-emitting diode (LED) for the "AUTO" button lights up.

"A/C" button (without code (965) Electrical preinstallation for rental vehicle)
Pressing the "A/C" button switches the refrigerant compressor on or off with "circuit 61 ON".

All other functions are retained. The LED for the "A/C" button lights up when the refrigerant compressor is switched on.

"A/C, REST" button (with code (965) Electrical preinstallation for rental vehicle)
Pressing the "A/C, REST" button switches the refrigerant compressor on or off with "circuit 61 ON". All other functions are retained.
The LED for the "A/C, REST" button lights up when the refrigerant compressor is switched on. With "circuit 15 OFF", pressing the "A/ C, REST" button activates the residual engine heat utilization function. The LED of the "A/C, REST" button also lights up when the function is activated. With "circuit 15 ON", the function is interrupted again.

The electronic ignition lock control unit (N73) transmits the circuit 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 for the rear window heater button lights up 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
When the "ZONE" button is pressed, the temperature values set on the driver side are adopted for the passenger side. The LED in the "ZONE" button goes out when the function is activated.

If the temperature for the passenger side is adjusted manually, the LED in the "ZONE" button lights up. A multizone temperature control in the vehicle is thus shown.

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 for the air recirculation mode button lights up 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 roof) or the panoramic sliding sunroof (with code (413) Panoramic glass sunroof with top sliding sunroof) are then closed. When the air recirculation mode button is pressed again for t > 1.5 s, the side windows and the tilting/sliding roof or the panoramic sliding sunroof return to their previous positions.

The side windows, the tilting/sliding roof or the panoramic sliding sunroof, which were manually opened during the air recirculation phase, are not moved back to their previous positions once the air recirculation phase is over.

On vehicles with code (460) Canada version or code (494) USA version, comfort air recirculation closing is not possible.

The detailed comfort air recirculation closing procedure is described in the convenience feature (CF [KFB]) function description.

Defrosting button
When the defroster button is pressed, all air flaps at the air conditioner housing are closed with the exception of the defroster flaps and the fresh air/recirculated air flap. These are fully opened.

The defroster flaps are adjusted so that the maximum air flow is directed to the windshield and the front side windows. The blend air flaps are set to full warm air supply. The blower output is regulated to match the coolant temperature. If the function is activated, the LED for the defroster button lights up.

"MAX COOL" button (with code (494) USA version)
Pressing the "MAX COOL" button raises the basic ventilation to the maximum value.
The "MAX COOL" indication is shown in the display and the LED for the "MAX COOL" button lights up.

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 vent air outlet temperature sensor (B10/31)
- Right side air vent air outlet temperature sensor (B10/32)
- Left front footwell vent 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) Power glass tilting/sliding roof)

Climate control LIN
The following sensor is read in via climate control LIN:
- Vehicle interior humidity/temperature sensor (B82) (model 212.2 as of 1.12.2009 and model 212.0 as of YoM 09/2 as of 1.12.2009)

Interior CAN
The following signals are read in over the interior CAN:
- Provided by instrument cluster (A1):
- Vehicle speed
- Provided by 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)):
- Status of voice control system (VCS)
- Provided by 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) (with code (414) Electric glass tilting/sliding roof)
- Provided by electronic ignition lock control unit:
- Status of circuit 15

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 via the following lines:
^ 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 engine 271.8, 642.8 or 651.9)

Interior CAN
The following components are actuated with the interior CAN:
- From the rear SAM control unit with fuse and relay module:
- Refrigerant compressor control valve
- From the left front door control unit (N69/1):
- Left front door power window motor (M10/3)
- From the right front door control unit (N69/2):
- Right front door power window motor (M10/4)
- From the left rear door control unit (N69/3):
- Left rear door power window motor (M10/5)
- From the right rear door control unit (N69/4):
- Right rear door power window motor (M10/6)
- From the overhead control panel control unit:
- Tilting/sliding roof motor (M12m1) (with code (414) Electric glass tilting/sliding roof)
- From the panoramic sliding sunroof control module (A98):
- Panoramic sliding sunroof motor (A98m1) (with code (413) Panoramic glass sunroof with top sliding sunroof)