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
^ AAC multifunction sensor (B31/1)
^ AAC [KLA] 4-way sun sensor (B32/2)

The following components are actuated by the AAC [KLA] control unit:
direct
^ Refrigerant compressor (A9)
^ additionally with code (582) Rear air conditioner:
- Rear auxiliary heating system delivery unit (A31/1)
- Rear air conditioning electronic blower controller (N29/2)
- Rear AC refrigerant shutoff valve (Y67)

Via the AC LIN
^ Blower regulator (A32n1)
^ Fresh air flap/recirculated air flap actuator motor (M2/5)
^ Left defroster vent flap actuator motor (M2/8)
^ Right defroster vent flap actuator motor (M2/9)
^ Left footwell flap actuator motor (M2/10)
^ Right footwell flap actuator motor (M2/11)
^ Left center air flap actuator motor (M2/12)
^ Right center air flap actuator motor (M2/13)
^ Left side outlet flap actuator motor (M2/17)
^ Right side outlet flap actuator motor (M2/18)
^ Upper left blend air flap actuator motor (M2/30)
^ Lower left blend air flap actuator motor (M2/31)
^ Upper right blend air flap actuator motor (M2/32)
^ Lower right blend air flap actuator motor (M2/33)
^ Left B-pillar air distribution actuator motor (M16/33) (with model 221)
^ Right B-pillar air distribution actuator motor (M16/34) (with model 221)
^ PTC heater booster (R22/3) (with diesel engine)
^ additionally with code (582) Rear air conditioner:
- Left rear center air outlet actuator motor (M16/19)
- Right rear center air outlet actuator motor (M16/20)

Via the interior CAN
^ by the front SAM control unit with fuse and relay module (N10/1)
- Coolant circulation pump (M13)
- Air conditioner water valve (Y19/2)

Via the chassis CAN and the central gateway control unit (N93)
^ by the CDI control unit (N3/9) (with diesel engine) or by the ME- SFI [ME] control unit (N3/10) (with gasoline engine)
- Engine and air conditioning electric suction fan with integrated control (M4/7)