Automatic air conditioning control unit, component description - GF83.40-P-3012SX

MODEL 216.3, 221.0 /1 up to Model Year 8 

Shown on model 221.0 

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)