Model 117, 156, 176, 242 (except 242.890), 246 except CODE 581 (Automatic air conditioning) |
N22/7 | Automatic air conditioning control and operating unit |
P83.40-4478-04
Control element | Controllable function | Operating feedback |
Rear window heater button (N22/7s1) | Rear window heater ON/OFF | Integrated LED |
Air recirculation mode button (N22/7s2) | Air recirculation mode ON/OFF | Integrated LED |
Defrosting button (1) | Defrost mode ON/OFF | Integrated LED |
"A/C" button (2) | Refrigerant compressor ON/OFF | Integrated LED |
Temperature selector wheel (3) | Setting of specified temperature | LED on circumference of selector wheel |
Air volume selector wheel (4) | Nominal air volume setting | LED on circumference of selector wheel |
Windshield air distribution button (5) | Windshield air distribution On/Off | Integrated LED |
Center air distribution button (6) | Center air distribution ON/OFF | Integrated LED |
Lower air distribution button (7) | Lower air distribution ON/OFF | Integrated LED |
With code 581 (Automatic air conditioning) |
N22/7 | Automatic air conditioning control and operating unit |
P83.40-4479-04
Control element | Controllable function | Operating feedback |
Rear window heater button (N22/7s1) | Rear window heater ON/OFF | Integrated LED |
Air recirculation mode button (N22/7s2) | Air recirculation mode ON/OFF | Integrated LED |
Heated windshield defrost button (N22/7s4) (model 242.890) | Heated windshield ON/OFF | Integrated LED |
Defrosting button (N22/7s4) (except model 242.890) | Defrost mode ON/OFF | Integrated LED |
"A/C" button (2) | Refrigerant compressor ON/OFF | Integrated LED |
Left temperature selector wheel (3.1) | Configuration of specified temperature at left | Display (16) |
Right temperature selector wheel (3.2) | Configuration of specified temperature at right | Display (16) |
"OFF" button (8) | Air conditioning On/Off | Integrated LED |
"REST" button (9) | Residual heat utilization ON/OFF | Integrated LED |
"AUTO" button (10) | Automatic mode ON/OFF | Integrated LED |
"ZONE" button (11) | Take over settings of driver side for passenger side | Integrated LED |
Reduce air volume button (12) | Reduce air volume | Display (16) |
Increase air volume button (13) | Increase air volume | Display (16) |
"MODE" button downward (14) | Change air distribution | Display (16) |
"MODE" button upward (15) | Change air distribution | Display (16) |
MODEL 117, 156, 242, 246
with CODE 494 (US version)
The "MAX COOL" button is installed instead of the "REST" button.
Location
The control and operating unit is located in the center console.
Task
The control and operating unit has 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 (LIN B8)
Interior CAN (CAN B)
Direct line
The signals from the following sensors are read via direct lines:
Interior temperature sensor (B10/4) (with CODE 581 (Automatic air conditioning))
Evaporator temperature sensor (B10/6)
Refrigerant pressure sensor (B12/2)
Sun sensor (B32/3) (with CODE 581 (Automatic air conditioning))
Central air distribution position recognition microswitch (S24/1) (with CODE 581 (Automatic air conditioning))
Climate control LIN
The signals of the air quality sensor (B31) (with CODE 581 (Automatic air conditioning)) are read in via the climate control LIN.
Interior CAN
The following signals, among others, are read in via interior CAN:
Terminal status of terminal 15
Outside temperature
Vehicle speed
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).
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 components are actuated via the following connections:
Direct line
Climate control LIN
Climate control LIN (LIN B8-1) (model 242.890)
Direct line
The following components are actuated via direct lines:
A/C compressor regulating valve (A9y1) (except CODE B09 (A/C compressor with magnetic clutch))
A/C compressor regulating valve (A9/7y1) (with CODE B09 (A/C compressor with magnetic clutch))
A/C compressor magnetic clutch (A9/7y2) (with CODE B09 (A/C compressor with magnetic clutch))
Heated rear window relay (F34kD)
Coolant circulation pump (M13/5) (with CODE 581 (Automatic air conditioning) and except CODE 494 (USA version))
Front evaporator shutoff valve (Y19/3) (model 242.890)
Climate control LIN
The following components are actuated via climate control LIN:
Blower regulator (A32n1)
Central air distribution actuator motor (M2/4)
Fresh air/recirculated air flap actuator motor (M2/5)
Left blend air flap actuator motor (M2/6)
Right blend air flap actuator motor (M2/7) (with CODE 581 (Automatic air conditioning))
PTC heater booster (R22/3) (diesel engine)
Climate control LIN (model 242.890)
The following components are actuated via the climate control LIN:
Electric refrigerant compressor (A9/5)
Heater circuit circulation pump (M91/6)
High voltage PTC heater (N33/5)
Transmitting signals
The signals are transmitted by the control and operating unit via the interior CAN.
The functions that use these signals are described in the individual function descriptions (see block diagram or function schematic).