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

GF83.40-P-3000RI Automatic Air Conditioning Control And Operating Unit, Component Description

Component Identification:

Location
The control and operating unit is located in the center console.

Design
The control and operating unit contains the following controls and displays:
- Left temperature selector wheel (1)
- Left air distribution indicator (2)
- Left air distribution button (3)
- Defrosting button (4)
- Right temperature selector wheel (5)
- Right air distribution indicator (6)
- Right air distribution button (7)
- A/C, REST button (8)
- Blower selector wheel (9)
- OFF button (10)
- AUTO button (11)
- Heated rear window switch (N22s1)
- Air recirculation switch (N22s2)

With code (494) USA version the A/C button is installed instead of the A/C, REST button. The residual engine heat utilization function is not available.

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
- Air distribution separately for the left and right sides
- 9-stage blower control
- Switching the automatic air conditioning on and off
- Defrost function
- Switch refrigerant compressor (A9) on and off
- Residual engine heat utilization (without code (494) USA version)
- Recirculated air mode
- Pollutant-dependent fresh air supply via activated charcoal filter
- Heated rear window (R1) actuation
- Solar radiation-dependent temperature control and air distribution

It is operated with the following buttons:
^ OFF button
^ Temperature selector wheel
^ Blower selector wheel
^ Air distribution button
^ AUTO button
^ A/C, REST button
^ Heated rear window switch
^ Air recirculation mode switch
^ Defrosting button

OFF button
The automatic air conditioning can be switched off completely or switched back on by pressing the OFF button.

Temperature selector wheel
The specified temperature setting for the left and right sides can be set separately by turning the associated temperature selector wheel. The selected specified temperature is displayed via LEDs on the circumference of the temperature selector wheel.

Blower selector wheel
The air volume can be manually adjusted in nine stages by turning the blower selector wheel. The blower output setting is indicated by the light segment on the selector wheel.

Air distribution button
The air distribution button can be used to manually adjust the air distribution. The air distribution setting is shown in the air distribution indicator located above the button.

AUTO button
The air volume and the air distribution are regulated automatically when the AUTO button is pressed. If automatic mode is activated the LED illuminates.

A/C, REST button
Pressing the A/C REST button switches off the refrigerant compressor. All other functions are retained. The LED illuminates when the refrigerant compressor is switched on.
With circuit 15C or circuit 15R, the residual engine heat utilization system function is activated when the A/C, REST button is pressed. When the function is activated, the LED illuminates.

Rear window heater switch
The rear window heater is switched on when the rear window heater switch is pressed. The LED illuminates during operation.

Air recirculation mode switch
Briefly pressing the air recirculation mode switch for t < 1.5 s closes the fresh air and air recirculation flap to stop air entering from outside. The LED illuminates during operation.
If the switch is pressed for a longer period of t > 1.5 s, the control and operating unit transmits the "Close recirculated air" or "Open recirculated air" command via the interior CAN. The windows are then closed or opened.

With code (460) Canada version and code (494) USA version, convenience recirculation closing is not possible.

The detailed convenience recirculation closing procedure is described in the convenience feature function (KFB).

Defrosting button
Pressing the defrosting button sets the temperature to "maximum" and distributes the air flow to the defroster vents. All the other flaps are closed. The blower output is regulated to match the coolant temperature. The LED in the defrosting button illuminates.

Reading in of sensors and signals
The input factors are read in with the following connections:
^ Direct line
^ AC bus
^ Interior CAN

Direct line
The following sensors are read in via a direct line:
- Evaporator temperature sensor (B10/6)
- In-car temperature sensor (N22b1)

The following signals are read in via a direct line:
- Center air vents potentiometer
- Side air vents potentiometer
- AAC [KLA] center and side air vent control system (N18/2)

AC bus
The following sensors are read in via the AC bus:
- AAC [KLA] multifunction sensor (B31/1)
- AAC [KLA] 4-way sun sensor (B32/2)

Interior CAN
The following signals and sensors are read in via interior CAN:
By the instrument cluster (A1):
- Ground speed
by the rear SAM control unit (N10/8):
- Left door contact switch (S17/3)
- Right door contact switch (S17/4)
by the driver-side SAM control unit (N10/10):
- refrigerant pressure sensor (B12)
- Outside temperature indicator temperature sensor (B14)
By the overhead control panel control unit (N70):
- In-car temperature sensor (N70b1)
By the EIS [EZS] control unit (N73):
- Coolant temperature sensor (B11/4)
- Circuit 15
- Engine speed

Evaluation of input factors
The input factors that are read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components
Components are actuated with the following lines:
^ Direct line
^ AC bus
^ Interior CAN

Direct line
The following component is actuated via a direct line:
- Heat exchanger shutoff motor (M16/32)

AC bus
The following components are actuated via the AC bus:
- Blower regulator (A32n1)
- Left defroster vent flap actuator motor (M16/13)
- Right defroster vent flap actuator motor (M16/14)
- Left footwell flap actuator motor (M16/15)
- Right footwell flap actuator motor (M16/16)
- Fresh air/air recirculation flap actuator motor (M16/21)
- Left center air flap actuator motor (M16/23)
- Right center air flap actuator motor (M16/24)
- Air flap actuator motor, left side vent (M16/25)
- Air flap actuator motor, right side vent (M16/26)
- Left blend air flap actuator motor (M16/28)
- Right blend air flap actuator motor (M16/29)

Interior CAN
The following components are actuated with the interior CAN:
by the driver-side SAM control unit:
- Refrigerant compressor control valve
by the rear SAM control unit:
- Rear window defroster

From the passenger-side SAM control unit (N10/11):
- Coolant circulation pump (M13)
by the EIS [EZS] control unit:
- Engine and air conditioning electric suction fan with integrated control (M4/7) via the ME-SFI [ME] control unit (N3/10)