Climate Control, Control Unit, Component Description - GF83.40-P-2250LF

Model 217, 222 

Shown on model 222 

Location 

The A/C control unit is located on the front side of the A/C housing on the passenger side.

Task 

The A/C control unit is responsible for the following tasks:

• Read in sensors and signals 
• Evaluation of input factors 
• Actuation of components 
• Transmitting signals 

Read in sensors and signals 

The input factors are read in via the following connections:

• Direct line 
• Climate control LIN 2 (LIN B8-2) 
• Air conditioning control LIN 3 (LIN B8-4) (with code 1U6 (Refrigerant R744)) 
• A/C operating unit LIN (LIN B8-3) 
• Interior CAN (CAN B) 

Direct line 

The climate control, control unit reads in the signals from the following components via direct lines:

• Evaporator temperature sensor (B10/6)
• Left rear air conditioning system heat exchanger temperature sensor (B10/9) (model 222 with code 582 (A/C system in rear))
• Right rear air conditioning system heat exchanger temperature sensor (B10/10) (model 222 with code 582 (A/C system in rear))
• Rear air conditioning system evaporator temperature sensor (B10/11) (model 222 with code 582 (A/C system in rear))
• Left side air vent air outlet temperature sensor (B10/31)
• Right side air vent air outlet temperature sensor (B10/32)
• Left footwell vent air outlet temperature sensor (B10/35)
• Right footwell vent air outlet temperature sensor (B10/36)
• Refrigerant pressure sensor (B12) (except code 1U6 (Refrigerant R744))
• CO₂ pressure/temperature sensor downstream of gas cooler (B12/4) (with code 1U6 (Refrigerant R744))
• CO₂ pressure/temperature sensor upstream of gas cooler (B12/5) (with code 1U6 (Refrigerant R744))
• Sun sensor (B32/3)
• Left side air vent potentiometer (R41/5)
• Right side air vent potentiometer (R41/6)
• Left center air vent potentiometer (R41/7)
• Right center air vent potentiometer (R41/8)
• Left rear center air vent potentiometer (R41/9)
• Right rear center air vent potentiometer (R41/10) (model 222 with code 582 (A/C system in rear))

Climate control LIN 2 

The climate control, control unit reads in the signals from the following components over the climate control LIN 2:

• Multifunction sensor (B31/1)
• High voltage PTC heater temperature sensor (N33/5b1) (model 222.163/173)
• Stationary heater control unit (A6n1) (model 217.3, 222 as of model year 2018 with code 228 (Stationary heater))

Air conditioning control LIN 3 (with code 1U6 (Refrigerant R744)) 

The climate control, control unit reads in the signals from the following component parts via the air conditioning control LIN 3:

• CO₂ sensor (B98)
• Rear CO₂ sensor (B98/1) (model 222 with code 582 (Rear air conditioning system))

AC operation LIN 

The climate control, control unit reads in the signals from the following components via the climate control LIN:

• Stationary heater radio remote control receiver (A6/1) (model 217.3, 222 as of model year 2018 with code 228 (Stationary heater))
• Rear A/C system operating unit (N22/4) (model 222 with code 582 (A/C system in rear))
• Climate control operating unit (N58/1)

Interior CAN 

The climate control, control unit receives the following information via the interior CAN, among others:

• Outside temperature
• Interior temperature
• Status of side window
• Status of panoramic sliding sunroof (model 222 with code 413 (Panoramic sliding sunroof))
• Status of high-voltage battery (model 222.004/057/104/157/163/173)
• Status of pre-entry climate control (model 222.004/057/104/157/163/173)
• Coolant temperature
• Vehicle speed
• Engine speed
• Crash signal

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

Actuation of components 

The actuation of the components takes place via the following connections:

• Direct line 
• Climate control LIN 1 (LIN B8-1) 
• Climate control LIN 2 
• Air conditioning control LIN 3 (with code 1U6 (Refrigerant R744)) 

Direct line 

The climate control, control unit actuates the following components via direct lines:

• Refrigerant compressor (A9) (model 217, 222 (except model 222.004/057/104/157/163/173) except code B09 (Refrigerant compressor with magnetic clutch)) or refrigerant compressor with magnetic clutch (A9/7) (with code B09 (Refrigerant compressor with magnetic clutch))
• Rear heating system valve unit (A31/1) (model 222 with code 582 (A/C system in rear))
• Coolant circulation pump (M13/5)
• Air conditioning water valve (Y19/2)
• Front evaporator shutoff valve (Y19/3) (model 222.004/057/104/157/163/173 or model 222 with code 582 (Rear air conditioning system))
• Rear A/C system evaporator shutoff valve (Y19/9) (model 222 with code 582 (A/C system in rear))

Climate control LIN 1 

The climate control, control unit actuates the following component parts via the air conditioning control LIN 1:

• Air recirculation flap actuator motor (M2/5)
• Left defroster flap actuator motor (M2/8)
• Right defroster flap actuator motor (M2/9)
• Left footwell flap actuator motor (M2/10)
• Right footwell flap actuator motor (M2/11)
• Left center air vent flap actuator motor (M2/12)
• Right center air vent flap actuator motor (M2/13)
• Left side air vent flap actuator motor (M2/17)
• Right side air vent 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)
• Fresh air/ram air flap actuator motor (M2/34)
• Left A-pillar air distribution actuator motor (M16/11)
• Right A-pillar air distribution actuator motor (M16/12)
• Left B-pillar air distribution actuator motor (M16/33) (model 222)
• Right B-pillar air distribution actuator motor (M16/34) (model 222)
• Left rear center air vent actuator motor (M16/51) (model 222)
• Right rear center air vent actuator motor (M16/52) (model 222 with code 582 (A/C system in rear))
• PTC heater booster (R22/3) (model 222 with diesel engine)

Climate control LIN 2 

The climate control, control unit actuates the following components via climate control LIN 2:

• Stationary heater control unit (model 217.3, 222 as of model year 2018 with code 228 (Stationary heater))
• Blower regulator (A32n1)
• Electric refrigerant compressor (A9/5) (model 222.004/057/104/157/163/173)
• Rear blower motor (M2/1) (model 222 with code 582 (A/C system in rear))
• Driver side air vent ionizer (N18/9) (with CODE P21 (AIR-BALANCE package))
• High-voltage PTC heater (N33/5) (model 222.163/173)
• Perfume atomizer generator (N59) (with CODE P21 (AIR-BALANCE package))

Air conditioning control LIN 3 (with code 1U6 (Refrigerant R744)) 

The climate control, control unit actuates the following component parts via the air conditioning control LIN 3:

• CO₂ expansion valve (Y148)
• Rear air conditioning system CO₂ expansion valve (Y148/2) (model 222 with code 582 (Rear air conditioning system))

Transmitting signals 

The climate control, control unit transmits the following signals via the interior CAN, among other things:

• Status of high-voltage PTC heater (model 222.163/173)
• Request for specified engine speed
• Request for pre-entry climate control (model 222.004/057/104/157/163/173)
• Ionization status (with code P21 (Air quality package))
• Fragrancing status (with code P21 (Air quality package))
• Status of stationary heater/stationary ventilation (model 217.3, 222 as of model year 2018 with code 228 (Stationary heater))
• Status of convenience feature
• Diagnosis request
• Request for message display

	Wiring diagram for automatic air conditioning (AAC [KLA]) control unit	Model 217, 222 up to model year 2018	PE83.40-P-2101-97SEA
		Model 217, 222 as of model year 2018	PE83.40-P-2101-97SED