CLK 350 Cabriolet (209.456) V6-3.5L (272.960) (2006)
Control Module HVAC: Description and Operation
GF83.40-P-2181-01QB Control and Operating Unit Comfort Automatic Air Conditioning, Task
GF83.40-P-2181-01QB Control And Operating Unit Comfort Automatic Air Conditioning, Task
- 209.3/4 as of 1.6.04
- with CODE (581) Comfort automatic air conditioning
Component Identification
Task
The comfort AAC control and operating module (N22/7) controls and regulates all air conditioning functions for the vehicle interior.
^
harmonizing the temperatures preselected and actually present and controlling the air outlet temperature at the air vents.
^
Automatic switchover from fresh air to air recirculation mode
^
Electrical control of refrigerant compressor
^
Operating the engine/AC electric suction fan 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):
^
Heated rear window
^
Stationary heater (on vehicles with code (228) stationary heater)
The comfort AAC control and operating module (N22/7) performs the following system actuations:
^
Via the CAN-B: refrigerant compressor, coolant circulation pump, engine and AC electric suction fan with integrated control
^
Via the A/C bus: air recirculation unit and 10 actuator motors for air distribution
The following sensor signals are received by the convenience AAC pushbutton control unit (N22/7):
^
sensor installed: in-car temperature sensor (N22/7b1)
^
direct: evaporator temperature sensor
^
via the CAN-B:
-
outside temperature display temperature sensor, refrigerant pressure and temperature sensor (via the front SAM control unit with fuse and relay
module)
-
battery voltage, coolant temperature sensor, engine speed (via the EIS [EZS] control unit)
-
ground speed (via the instrument cluster)
-
in-car temperature sensor as of 1.6.05 (via the overhead control panel control unit)
^
via the A/C bus:
-
C-AAC [K-KLA] multifunction sensor
-
C-AAC sun sensor (4 in total)
The comfort AAC [KLA] control and operating unit (N22/7) reads in the position of the windows and doors as well as the position of the tilting/sliding
roof (with code (414) Power glass titling/sliding roof) in order to achieve an improved control quality when they are open.
Temperature button warm left (1) and temperature button warm right (2)