CLK 320 (209.365) V6-3.2L (112.955) (2004)
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Control Module HVAC: Description and Operation
GF83.40-P-2181-01Q Control and Operating Unit Comfort Automatic Air Conditioning, Task
GF83.40-P-2181-01Q Control And Operating Unit Comfort Automatic Air Conditioning, Task
- 209.3 up to 31.5.04
- with CODE (581b) Convenience automatic air conditioning
Component Identification
Task
The comfort AAC control and operating unit (N22/7) controls and regulates all air conditioning functions for the vehicle interior.
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harmonizing the preselected and actual temperatures and controlling the air outlet temperature at the air vents.
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Automatic switchover of fresh air to recirculated air mode.
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Electrical actuation of refrigerant compressor.
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Actuation of the electric suction fan engine and AC with integrated control
The following additional functions are also regulated by the comfort AAC [KLA] control and operating unit (N22/7) and the required information is
forwarded to the processing control units via the Controller Area Network Bus Class B (interior) (CAN-B).
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Heated rear window
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Stationary heater (on vehicles with code (228) stationary heater)
The comfort AAC control and operating unit (N22/7) performs the following system actuations:
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Via the CAN-B: refrigerant compressor; coolant circulation pump; engine and AC electric suction fan with integrated control
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Via the A/C bus: blower regulator; 10 stepper motors for air distribution
The following sensor signal is transmitted by the comfort AAC (C-AAC [K-KLA]) control and operating unit (N22/7) via the CAN-B:
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Sun sensor values (the overhead operating unit reads in these values for the automatic light control in order to achieve a better redundancy for the
system))
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Dew point temperature (the left door control unit and the right door control unit read in this value to implement a demand- based heated outside
mirror)
The following sensor signals are received by the convenience AAC pushbutton control unit (N22/7):
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Installed sensor: in-car temperature sensor (N22/7b1)
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direct: evaporator temperature sensor
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via the CAN B: outside temperature display temperature sensor; refrigerant pressure and temperature sensor
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via the electronic ignition switch control unit: battery voltage; coolant temperature sensor; engine speed
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via the instrument cluster: vehicle speed
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via the A/C bus: C-AAC sun sensor (4 in total); C-AAC [KKLA] multifunction sensor
The comfort AAC (C-AAC [K-KLA]) control and operating unit (N22/7) reads in the window and door positions as well as the tilting/sliding roof
