Comfort automatic air conditioning control and operating unit, component description - GF83.40-P-3010RTU
MODEL 251.1 with CODE (581) Comfort automatic air conditioning with CODE (494) USA version with CODE (582) Rear air conditioner
MODEL 164.8 with CODE (581) Comfort automatic air conditioning with CODE (494) USA version with CODE (582) Rear air conditioner
Shown on model series 251.1
Location
The comfort AAC control and operating unit is located in the instrument panel.
Design
The comfort AAC control and operating unit contains the following controls and displays:
- Driver side temperature dial (1)
- Automatic button (2)
- Button for air distribution in left head area (3)
- Window defrost button (4)
- Increase air volume button (5)
- Heated rear window switch (N22/7s1)
- Button for air distribution in right head area (6)
- REAR button (7)
- Passenger side temperature dial (8)
- OFF button (9)
- Button for air distribution in right footwell (10)
- Button for air distribution, center right (11)
- AC-OFF Rest button (12)
- Display (13)
- Button for decreasing the air flow (14)
- Air recirculation switch (N22/7s2)
- Button for air distribution, center left (15)
- Button for air distribution in left footwell (16)
- In-car temperature sensor (N22/7b1)
- MONO button (17)
The AAC control and operating unit is used to control the following:
- Switching the air conditioning system on and off
- Cold/warm interior temperature programming separately 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 coupling the front passenger temperature selection with that of the driver-side
- Rear air conditioner remote control
The comfort AAC control and operating unit is used to actuate the following:
Discreet:
- Refrigerant compressor (A9)
- Coolant circulation pump (M13)
- Rear AC additional circulation pump (M13/1)
- Coolant shutoff motor (M16/41)
- Rear air conditioning blower regulator (N29/7)
- AC system shutoff valve (Y19/1)
Via the Control Area Network bus, class B (interior compartment) (CAN B):
- Heated rear window (R1) via rear SAM control unit (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 operation for windows and tilting/sliding roof (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)
- Rear air conditioning blower regulator
- Dew point sensor (B11/12)
- Fresh air flap/recirculated air flap actuator motor (M2/5)
- Left blend air flap actuator (M2/6)
- Right blend 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 flap actuator motor (M16/24)
- Diverter flap actuator motor (M16/27)
- 3rd seat row air distribution actuator motor (M16/43)
- 3rd seat row blend air flap actuator motor (M16/44)
The following sensor signals are read in by the comfort AAC control and operating unit:
- In-car temperature sensor (N22b1)
- Refrigerant pressure sensor (B12)
- Evaporator temperature sensor (B10/6)
- Rear air conditioning evaporator temperature sensor (B10/11)
- Dual sun sensor (B32/3)
- Center rear interior temperature sensor (B10/7)
- 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)
- Rear headroom AC temperature sensor (B10/37)
- Footwell rear AC temperature sensor (B10/38)
- Outside temperature indicator temperature sensor (B14)
- Emissions sensor (B31)
Via LIN bus: dew point sensor (B11/12)
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
- C. 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 the rotary tumblers in the doors
- Position of the pop-out windows
- Overhead control panel control unit
- Position of the tilting/sliding roof
- Position of the panoramic sliding roof
Control 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 into the individual areas can be controlled by pressing the particular button.
Increase air volume button /Decrease air volume button
The air volume can be selected manually by actuating the appropriate button.
Display
The blower power or the active or inactive REAR function is shown in the display. "MAX COOL" is also displayed at maximum cooling power.
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 button
The comfort automatic air conditioning (C-AAC [K-KLA]) can be switched off completely and switched on again by pressing the OFF button. The main air flap is closed or opened accordingly.
- Remote control for rear AC functions
When the REAR button on the comfort AAC control and operating unit (N22/7) is pressed, the operating unit symbol appears in the front display. The blower setting is not visible. The rear temperatures can be set on the keyboard. The function is stopped automatically, if operation is not performed within approx. t = 5 s or the REAR button is pressed again. When the AUTO button or the REAR Button is pressed, the REAR operation can be stopped.
REST 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
Pressing the AC-OFF button switches off the refrigerant compressor. All other functions are retained. When the refrigerant compressor is switched off, the indicator LED comes on.
REAR button
The REAR button can be used to change the rear temperature values via the comfort AAC 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.
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 opening/closing of windows and the tilting/sliding roof (on vehicles with power glass tilting/sliding roof, code 414) is activated.
Heated rear window switch
When the button is pressed, the comfort automatic air conditioning control and operating unit transmits a switch-on request via CAN-B to the rear SAM control unit, and the function LED in the heated rear window switch comes on at the same time.
Button for window defrosting
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.