GF83.40-P-2004MCU Regulation of Automatic Air Conditioning, Function

GF83.40-P-2004MCU Regulation Of Automatic Air Conditioning, Function
- with CODE (I01) Air conditioning Plus







1 Outside air temperature
2 Actuation of the blend air flap/air recirculation flap
3 Temperature on evaporator
4 Refrigerant pressure
5 Coolant temperature
6 Position feedback of blend air flap
7 Request of refrigerant compressor
8 Actuation of refrigerant compressor
9 Status of refrigerant compressor
A1 Instrument cluster
A9 Refrigerant compressor
B10/6 Evaporator temperature sensor
B11/4 Coolant temperature sensor
B12 Refrigerant pressure sensor
B14 Outside temperature display temperature sensor
M16/8 Blend air flap actuator
M39 Air recirculation flap actuator motor
N3/10 ME-SFI [ME] control unit
N10/10 SAM control unit
N23 Heater/AC operating unit
CAN Controller Area Network (data bus/CAN bus) (CAN)

Function
The automatic air conditioning is regulated via the heater/AC operating unit, which is networked with the vehicle electronics via CAN. This permits the best possible climate control while considering any climate-relevant events, as well as the adaptation of the engine management to the power absorption capacity of the refrigerant compressor.

The following information is directly read in by the heater/AC operating unit:
^ Evaporator temperature via evaporator temperature sensor
^ Refrigerant pressure via refrigerant pressure sensor
^ Interior temperature via the interior temperature sensor (N23b1) integrated in the heater/AC operating unit
^ Position feedback by the blend air flap actuator

The following information is transmitted to the heater/AC operating unit via CAN:
^ Outside temperature via the instrument cluster
^ Coolant temperature via the ME control unit

The following components are directly actuated by the heater/ AC operating unit:
^ Blend air flap actuator
^ Air recirculation flap actuator motor

The following components are actuated by the heater/AC operating unit via CAN:
^ Refrigerant compressor via SAM control unit

To prevent damage to the climate control system, the refrigerant compressor is switched off at refrigerant pressures above 28 bar.