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

Model 213 

up to model year 2021 

Location 

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

Tasks 

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

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

Reading in of sensors and signals 

The input factors are read in via the following connections:

• Direct line
• Climate control LIN 1 (LIN B8-1)
• 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 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)
• Rear footwell vent air outlet temperature sensor (B10/38) (with code 581 (Automatic air conditioning))
• 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))
• Central air distribution position recognition microswitch (S24/1) (with code 580 (Air conditioning))

AC control LIN 1 

The climate control control unit reads in the signals from the air quality sensor (B31) (with code 581 (Automatic air conditioning)) via climate control LIN 1.

Climate control LIN 2

The climate control control unit reads in the signals from the high voltage PTC heater temperature sensor (N33/5b1) (for hybrid vehicles) via air conditioning control LIN 2.

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

The climate control control unit reads in the CO2 sensor signals (B98) over the climate control LIN 3.

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) (with code 228 (Stationary heater))
• Climate control operating unit (N58/1)
• Rear air conditioning operating unit (N22/4) (with code 581 (Automatic air conditioning))

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 (with code 413 (Panoramic sliding sunroof)) or sliding roof (with code 414 (Sliding roof))
• Status of high-voltage battery (for hybrid vehicles)
• Status of auxiliary climate control (for hybrid vehicles)
• 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 relevant components are then actuated.

Actuation of components 

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

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

Direct line 

• Left footwell/center air vent/side air vent and rear air vent flap actuator motor (M2/11)
• Right footwell/center air vent and side air vent flap actuator motor (M2/12)
• Fresh air/ram air/air recirculation flap actuator motor
• Defroster/footwell/center air vent flap actuator motor
• Left B-pillar air distribution actuator motor (M16/33)
• Right B-pillar air distribution actuator motor (M16/34)

Climate control LIN 2 

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

• Stationary heater control unit (A6n1) (with CODE 228 (Stationary heater))
• Electric refrigerant compressor (A9/5) (for hybrid vehicles)
• Electronic blower motor (A32m1)
• Driver side air vent ionizer (N18/9) (with CODE P21 (Air quality package))
• Left electronic booster blower (N29/10) (with code 581 (Automatic air conditioning))
• Right electronic booster blower (N29/11) (with code 581 (Automatic air conditioning))
• High voltage PTC heater (N33/5) (for hybrid vehicles)
• Perfume atomizer generator (N59) (with CODE P21 (Air quality package))
• PTC heater booster (R22/3) (engine 654, 642 or 274 with code 401 (Seat climate control for driver and front passenger) or code 824 (Additional parts for countries with cold temperatures) or code 873 (Seat heating for driver and front passenger) or code 902 (Seat heating plus for driver and front passenger), except code 228 (Stationary heater) or code 913 (Hot countries code) or for hybrid vehicles)

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

The climate control control unit actuates the CO2 expansion valve (Y148) over the climate control LIN 3.

AC operation LIN 

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

• Climate control operating unit
• Rear air conditioning operating unit (with code 581 (Automatic air conditioning))

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

• Refrigerant compressor (A9) (model 213 (except for hybrid vehicles) except code B09 (Refrigerant compressor with magnetic clutch))
• Refrigerant compressor with magnetic clutch (A9/7) (with CODE B09 (Refrigerant compressor with magnetic clutch))
• Coolant circulation pump (M13/5)
• Front evaporator shutoff valve (Y19/3) (for hybrid vehicles)

AC control LIN 1 

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

• With code 580 (Air conditioning system):
  • Left blend air flap actuator motor (M2/8)
  • Right blend air flap actuator motor (M2/9)
  • Fresh air/ram air/air recirculation flap actuator motor (M2/13)
  • Defroster/footwell/center air vent flap actuator motor (M2/14)
• With CODE 581 (Automatic air conditioning):
  • Left blending air flap actuator
  • Right blending air flap actuator
  • Rear blend air flap actuator motor (M2/10)

Transmitting signals 

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

• Status of high voltage PTC heater (for hybrid vehicles)
• Engine fan specified rpm request
• Request for auxiliary climate control (for hybrid vehicles)
• Ionization status (with code P21 (Air quality package))
• Fragrancing status (with code P21 (Air quality package))
• Status of stationary heater/stationary ventilation (with code 228 (Stationary heater))
• Preselection time status
• Status of convenience feature
• Diagnosis request
• Request for message display

Wiring diagram for automatic air conditioning (AAC [KLA]) control unit

PE83.40-P-2101-97DBA