GF83.40-P-3000GZU Automatic Air Conditioning Pushbutton Control Unit, Component Description
GF83.40-P-3000GZU Automatic Air Conditioning Pushbutton Control Unit, Component Description
- with CODE (580) Automatic air conditioning
- except CODE (494) USA version
Location
The AAC control and operating unit is located on the instrument panel.
Design
The AAC control and operating unit contains the following controls and displays:
- Driver side temperature dial (1)
- Automatic button (2)
- Window defrost button (3)
- Increase air volume button (4)
- Headroom air distribution button (5)
- REAR button (6)
- Passenger side temperature dial (7)
- A/C Rest button (8)
- Center air distribution button (9)
- Footwell air distribution button (10)
- Air volume indicator (11)
- Reduce air volume button (12)
- Rear window heating button (13)
- Air recirculation switch (N22s2)
- In-car temperature sensor (N22b1)
- OFF button (14)
The AAC control and operating unit allows the following control actuations:
- Switching the air conditioning system on and off
- Interior compartment temperature selection cold/warm 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
The AAC control and operating unit takes over control of 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 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)
- Fresh air flap/recirculated air flap actuator motor (M2/5)
- Left blending air flap actuator (M2/6)
- Right blending air flap actuator (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)
The following sensor signals are read in by the AAC control and operating unit:
- In-car temperature sensor (N22b1)
- Evaporator temperature sensor (B10/6)
- Center rear interior temperature sensor (B10/7)
- Sun sensor (B32)
- 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)
- Refrigerant pressure sensor (B12)
- 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
- 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 rotary tumbler in doors
- Overhead control panel control unit
- Position of tilting/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.
Air volume indicator
Indication is accomplished by LEDs coming on. The more LEDs illuminated, the greater the air volume flowing into the vehicle interior.
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.
For USA version, code 494, "MAX COOL" is additionally displayed with maximum cooling output.
OFF button
The automatic air conditioning (AAC) can be switched off completely or switched back on by pressing the OFF button. The main air flap is closed or opened accordingly.
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
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 window heater button
When a button is pressed, the air conditioning sends a switch-on request via the CAN B bus to the rear SAM control unit; simultaneously, the indicator LED in the rear window heater button is switched on.
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.
With model 164.8, the left rear and right rear vent windows are actuated at the same time as part of the convenience feature.
Window defrost button
The temperature is set to "maximum" and the air flow distributed to the defroster and side air outlets. All the other flaps are closed. The blower is controlled depending on the coolant temperature. The indicator LED in the defrost button comes on.