GF83.40-P-3000TM Automatic Air Conditioning Control and Operating Unit, Component Description

GF83.40-P-3000TM Automatic Air Conditioning Control And Operating Unit, Component Description
- 219.3 as of 1.6.06
- with CODE (581) Comfort automatic air conditioning

Component Identification:

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:
^ Left temperature selector wheel (1)
^ Increase air volume button (2)
^ Display (3)
^ Air distribution button scroll up (4)
^ Right temperature selector wheel (5)
^ Residual heat button (6)
^ AC button (7)
^ Air distribution button scroll down (8)
^ On/off button (9)
^ Reduce air volume button (10)
^ Automatic button (11)
^ Heated rear window switch (N22s1)
^ Air recirculation switch (N22s2)
^ Window defrost switch (N22s3)

The AAC control and operating unit allows the following control actuations:
^ Switch automatic air conditioning (AAC [KLA]) on and off
^ Interior temperature selection separated for the left and right side
^ Manual blower control
^ Manual air distribution
^ Automatic blower control and air distribution
^ Air recirculation mode
^ Defrost function
^ Heated rear window (R1) actuation
^ Residual engine heat utilization system
^ Switch refrigerant compressor (A9) on and off

The AAC control and operating unit takes over control of the following:

Via the Control Area Network bus, class B (interior compartment) (CAN B):
- Refrigerant compressor and heat exchanger shutoff motor (M16/32) by the driver-side SAM control unit with fuse and relay module (N10/1)
- Coolant circulation pump (M13) by the passenger-side SAM control unit (N10/11)

Via Controller Area Network bus Class C (engine compartment) (CAN-C):
- Engine and air conditioning electric suction fan with integrated control (M4/7) via the central gateway control unit (N93), by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI [ME] control unit (N3/10) (with gasoline engine)

Via local interconnect network (LIN):
- blower regulator (A32n1)
- fresh air/air recirculation flaps actuator motor (M2/5)
- left blend air flap actuator motor (M2/6)
- right blend air flap actuator motor (M2/7)
- left and right footwell flaps actuator motor (M2/15)
- left and right defroster flaps actuator motor (M2/16)
- center air outlet flap actuator motor (M2/22)
- PTC heater booster (R22/3) (with diesel engine)

The following sensor signals are read in by the AAC control and operating unit:

^ Directly:
- In-car temperature sensor (B10/4) up to 31.8.06
- Evaporator temperature sensor (B10/6)

^ Via LIN:
- Air humidity sensor (B31/2) up to 31.8.06

^ Via CAN-B
from driver SAM control unit:
- Refrigerant pressure sensor (B12)
- Outside temperature display temperature sensor (B14)

^ Via CAN-B
by the overhead control panel control unit (N70):
- in-car temperature sensor (N70b1)

Control possibilities

Temperature selector wheel
The desired temperature setting for the left and right sides can be set by turning the associated temperature selector wheel. The selected specified temperature is shown on the display.

Air volume button
Pressing the respective air volume button enables the air volume to be manually selected.
The selected setting is shown on the display.

Air distribution button
The air distribution button can be used to manually adjust the air distribution. The selected air distribution setting is shown on the display.

Automatic button
The air volume and air distribution are regulated automatically when the automatic button is pressed. In automatic mode The. function LED comes on.

ON/OFF button
The automatic air conditioning can be completely switched off and on by pressing the on/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 motor (A32m1) operates using a preset fixed value. When the residual engine heat utilization system is activated, the function LED comes on.

AC button
Pressing the AC button switches the refrigerant compressor off. All other functions are retained.
The function LED comes on when the refrigerant compressor is switched on.

Heated rear window switch
When the button is pressed, the AAC [KLA] control and operating unit (N10/2) transmits a switch-on request to the rear SAM control unit with fuse and relay module via CAN-B; the function LED in the heated rear window switch is switched on at the same time.

Air recirculation switch
When the air recirculation switch is pressed briefly (< 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 (> 1.5 s), the comfort opening/closing windows and tilting/sliding roof (SHD) (for code (414) Power glass tilting/sliding sunroof) function is also activated.

Window defrost switch
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 function LED in the window defrost switch comes on.