GF83.40-P-3001MCU Component Description For the Heater/Air Conditioning Operating Unit
GF83.40-P-3001MCU Component Description For The Heater/air Conditioning Operating Unit
- with CODE (I01) Air conditioning Plus
1 Temperature preselection slider switch
2 Air distribution rotary switch
N23 Heater/AC operating unit
N23b1 Interior temperature sensor
N23s1 Heated rear window switch
N23s2 Air conditioning switch
N23s3 Air recirculation switch
S98/1 Blower switch
Location
The heater/AC operating unit is located in the center console.
The heater/AC operating unit permits the following operations:
^ Switching the air conditioning system on and off
^ Interior temperature selection cold/warm
^ Manual blower control
^ Manual air distribution
^ Recirculated air mode
^ Defrost function
^ Rear window heater
The heater/AC operating unit takes over the following actuations:
Via Controller Area Network (data bus/CAN bus) (CAN):
^ Refrigerant compressor (A9) via the SAM control unit (N10/10)
^ Blower motor (M2) via the SAM control unit
^ Heated rear window (R1) via the SAM control unit
Direct:
^ Recirculated air flap actuator motor (M39)
^ Blend air flap actuator (M16/8)
The heater/AC operating unit reads in the following sensor signals:
^ Direct:
- Interior temperature sensor (integrated in heater/AC operating unit)
- Evaporator temperature sensor (B10/6)
- Blend air flap actuator
^ Via CAN:
- Outside temperature through the instrument cluster (A1)
- Coolant temperature through the ME control unit (N3/10)
Design
The heater/AC operating unit contains the following controls and displays:
^ Air distribution rotary switch
^ Temperature preselection slider switch
^ Air conditioning switch
^ Air recirculation switch
^ Blower switch
^ Heated rear window switch
Air distribution rotary switch
The air distribution rotary switch is used to adjust which air outlet nozzles the air supplied by the blower motor (M2) is routed through into the interior.
For this purpose, 12 positions of the air distribution rotary switch are available, which are arranged in the following 3 main directions.
^ Defrost windshield
^ Footwell
^ Passenger compartment
If the air distribution rotary switch is turned to "Defrost windshield", the automatic air conditioning is switched on automatically without this being indicated by the light-emitting diode in the air conditioning switch. As long as the air distribution rotary switch is in this position, the automatic climate control cannot be switched off. The set temperature does not have any influence on this function.
Temperature preselection slider switch
The temperature preselection slider switch is used to determine, how much the air delivered by the blower motor is warmed up. The temperature preselection slider switch is read in by the heater/ air conditioner operating unit, which actuates the blend air flap via the blend air flap actuator.
Air conditioning switch
The air conditioning switch is used to switch the automatic air conditioning on or off.
At outside temperatures below 3 °C, the refrigerant compressor cannot be activated.
Air recirculation switch
When the air recirculation switch is operated, the heater/AC operating unit actuates the air recirculation flap actuator motor in order to close the air recirculation flap. When the air recirculation flap is closed, air supply from the outside is prevented. The LED in the air recirculation switch lights up during operation.
Blower switch
The 4-stage blower switch is used to define the intensity of the air the blower motor delivers into the vehicle interior.
Heated rear window switch
The heater/AC operating unit transmits, after the heated rear window switch is pressed, a switch-on request to the SAM control unit, which energizes the heated rear window (R1). Simultaneously, the LED in the rear window heater switch is switched on. If the heated rear window switch is pressed again, the actuation of the heated rear window is terminated.