Comfort automatic air conditioning control and operating unit, component description - GF83.40-P-3010GZE
MODEL 164 with CODE (581) Comfort automatic air conditioning except CODE (494) USA version up to Model Year 2008
Location
The comfort AAC [KLA] control and operating unit is located on the instrument panel.
Design
The comfort AAC [KLA] control and operating unit contains the following controls and displays:
- Driver side temperature dial (1)
- Automatic button (2)
- Left headroom air distribution button (3)
- Window defrost button (4)
- Increase air volume button (5)
- Heated rear window switch (N22/7s1)
- Right headroom air distribution button (6)
- Rear button (7)
- Passenger side temperature dial (8)
- OFF/REST button (9)
- Right footwell air distribution button (10)
- Right center air distribution button (11)
- A/C Rest button (12)
- Display (13)
- Reduce air volume button (14)
- Air recirculation switch (N22/7s2)
- Left center air distribution button (15)
- Left footwell air distribution button (16)
- In-car temperature sensor (N22/7b1)
- MONO button (17)
The comfort AAC [KLA] control and operating unit is used to control the following:
- Switching the air conditioning system on and off
- Cold/hot interior temperature preselection separate for left and right
- Manual blower control
- Manual air distribution
- Automatic blower control and air distribution
- Air recirculation mode
- Defrost function
- Rear window heater
- Residual engine heat utilization system
- Option for linking front passenger temperature preselection with that of the driver side
The comfort AAC [KLA] control and operating unit is used to actuate the following
Discreet:
- Coolant circulation pump (M13)
- Refrigerant compressor (A9)
Via the Control Area Network bus, class B (interior compartment) (CAN B):
- Heated rear window (R1) via rear SAM control module (N10/8)
- Engine and A/C electric suction fan with integrated control (M4/7) via the central gateway control unit (N93) on the ME control unit N3/10)
- Recirculated air actuation for windows and SHD (left front door control unit (N69/1), right front door control unit (N69/2), front SAM control unit (N10), rear SAM control unit and overhead control panel control unit (N70))
Via Local Interconnect Network (LIN):
- Blower regulator (A32n1)
- Fresh air flap/recirculated air flap actuator motor (M2/5)
- Left blending air flap actuator (M2/6)
- Right blending air flap actuator (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)
- Rear shutoff flap actuator motor (M2/12)
- Rear air distribution flap actuator motor (M2/21)
- Left center air flap actuator motor (M16/23)
- Right center air outlet flap actuator motor (M16/24)
- Diverter flap actuator motor (M16/27)
The following sensor signals are read in by the comfort AAC [KLA] control and operating unit:
- In-car temperature sensor
- Refrigerant pressure sensor (B12)
- Evaporator temperature sensor (B10/6)
- Dual sun sensor (B32/3)
- 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)
- Outside temperature indicator temperature sensor (B10/5)
- Dew point sensor (B11/12)
- Emissions sensor (B31)
Via CAN B:
- Overhead control panel control unit
- Rain/light sensor (B38/2)
- EIS control unit (N73)
- Circuit status
- Central gateway control unit and via ME control unit
- Motor speed
- Coolant temperature sensor (B11/4)
- Instrument cluster (A1)
- vehicle speed
- circuit 58d
- Left front door control unit, right front door control unit and front SAM control unit
- Position of side windows
- Rear SAM control unit
- Status of rotary tumbler in doors
- Overhead control panel control unit
- Position of tilting/sliding roof
Operating possibilities
Left temperature selector wheel/right temperature selector wheel
The desired temperature setting for the left and right sides can be set by turning the associated temperature selector wheel.
Air distribution buttons
The air distribution can be controlled towards the individual areas by actuating the corresponding button.
Increase air volume button/Decrease air volume button
The air volume can be selected manually by actuating the appropriate button.
Display
The blower output is indicated in the display.
Automatic button
The air volume and air distribution are regulated automatically when the automatic button is pressed. When the automatic mode is activated, the indicator LED comes on.
OFF/REST button
The comfort automatic air conditioning (C-AAC) can be switched off completely or switched back on by pressing the OFF/REST button. The main air flap is closed or opened accordingly.
The REST function is only possible with the ignition switched off or with the ignition/starter switch in position 1. Heating or just ventilation can be continued for approx. 30 min. If there is low voltage, the residual heat function is automatically switched off. The flaps are in automatic mode. The blower operates at a set fixed value. The function feedback signal is given via a red LED.
Residual heat button
The vehicle can be heated or ventilated only for up to 30 min by pressing the residual heat button. The function is only possible with circuit 15 off or circuit 15C on. If there is low voltage, the residual heat function is automatically switched off. The flaps are in automatic mode. The blower operates at a set fixed value. When the residua heat mode is activated, the indicator LED comes on.
AC-OFF button
The refrigerant compressor is switched off by pressing the AC-OFF button. All other functions are retained. When the refrigerant compressor is switched off, the function LED comes on.
Rear button
Using the Rear button, the rear temperature values can be changed via the comfort AAC [KLA] control and operating unit. By pressing the rear button, the rear specified value temperatures appear in the right temperature selector wheel. The blower setting is not visible.
Air recirculation switch
When the air recirculation switch is pressed momentarily (t < 1.5 s), the main air flap is closed to prevent air entering from outside. The function LED is illuminated during operation. When pressed for a longer period (t > 1.5 s), the convenience open/close window and tilting/sliding roof (SR) (on vehicles with power glass tilting/sliding roof, code 414) function is activated.
Heated rear window switch
When a button is pressed, the air conditioning sends a switch-on request via the CAN B to the rear SAM control unit; simultaneously, the indicator LED is switched on.
Window defrost button
The temperature is set to "maximum" and the air flow distributed to the defroster and lateral nozzles. All the other flaps are closed. The blower is controlled depending on the coolant temperature. The indicator LED in the defrost button comes on.