S 550 (221.171) V8-5.5L (273.961) (2007)
/v8-5.5l_(273.961)/Page-3161001.png)
Control Assembly: Description and Operation
GF83.40-P-3012SX Automatic Air Conditioning Control Unit, Component Description
GF83.40-P-3012SX Automatic Air Conditioning Control Unit, Component Description
Component Identification
Location
The AAC [KLA] control unit is located on the front side of the air conditioner housing on the passenger side.
Task
The AAC [KLA] control unit is the master control unit for the climate control of the vehicle interior and controls or regulates the following functions:
^
Air conditioning On/Off
^
Overall automatic system
^
Regulation of interior temperature, blower output and air distribution, separately for the left and right sides
^
Adaptation of the footwell temperature
^
Adjustment of the air flow intensity
^
Defrosting (Defrost)
^
Open/close recirculated air
^
Residual engine heat utilization system
^
Stationary heater climate control function (for code (228) Stationary heater)
^
Remote control of rear automatic air conditioning (for code (582) Rear air conditioner)
^
Coupling of all setting zones with driver zone
Automatic air conditioning functions are operated via the upper control panel control unit (N72/1) or the front central operating unit (A40/9).
With code (582) Rear air conditioner, the requests of the rear air conditioning control unit (N22/4) are received via the interior CAN by the AAC [KLA]
control unit.
The following components are read in directly by the AAC [KLA] control unit:
direct
^
In-car temperature sensor (B10/4)
^
Evaporator temperature sensor (B10/6)
^
Left side outlet temperature sensor (B10/31)
^
Right side outlet temperature sensor (B10/32)
^
Left footwell temperature sensor (B10/35)
^
Right footwell temperature sensor (B10/36)
^
Refrigerant pressure sensor (B12)
^
Left side air outlet potentiometer (R41/1)
^
Right side air outlet potentiometer (R41/2)
^
Left front center air outlet potentiometer (R41/3r1)
^
Right front center air outlet potentiometer (R41/3r2)
^
Left rear center air outlet potentiometer (R41/4r1)
^
Right rear center air outlet potentiometer (R41/4r2)
^
Left B-pillar air outlet potentiometer (R85/11) (model 221)
^
Right B-pillar air outlet potentiometer (R85/12) (model 221)
^
additionally, with code (582) Rear air conditioner
-
Left rear air conditioning heat exchanger temperature sensor (B10/9)
-
Right rear air conditioning heat exchanger temperature sensor (B10/10)
-
Rear air conditioning evaporator temperature sensor (B10/11)
Via the AC bus
