2003 AUDI A8 sensor
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Blower unit/air routing
As opposed to the predecessor model, the air
conditioner features an additional evaporator
outflow temperature sender G263. This is
installed in the air duct downstream of the
evaporator and constantly transmits the air
temperature downstream of the evaporator to
the Climatronic control unit J255.
If the left or right centre chest vent is closed
manually, the left/right centre vent control
motor V110/V111 is closed automatically by
the centre left/centre right G347/G348 vent
sensor signal.
Automatically controlled recirculated air
mode
Recirculated air mode is implemented
automatically for a certain period
– If the windscreen washer system switch is actuated or
– In the event of actuation by the air quality sensor G238
Heating/Air Conditioner
When replacing control motors, attention
must be paid to the assignment of the
flaps in the cam plate guides.
G150 Left vent temperature sender
G151 Right vent temperature sender
G263 Evaporator outflow temperature sender
V68
V71 Air-flow flap control motor
V102 Centre vent control motor
V107 Defroster flap control motor
V108 Left footwell flap control motor
V109 Right footwell flap control motor (not illustrated)
V113 Air-recirculation flap control motor
V199 Front right defroster/chest vent shutoff flap control motor
V200 Front left defroster/chest vent shutoff flap control motor
V218 Rear left vent control motor (4-zone system only)
V219 Rear right vent control motor (4-zone system only)Temperature flap control motor
Page 80 of 96
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Heating/Air Conditioner
SSP282_103 Fresh-air intake duct
temperature sensor G89
Flap control
motor potentiometers
G92, G113, G135, G136,
G137, G138, G139, G140,
G143, G317, G318, G349,
G350, G351, G352
Air quality sensor G238
Left/right vent temperature
sender G150/G151
Centre vent temperature
sender G191
Evaporator outflow temperature
sender G263
High-pressure sender G65
Sunlight penetration
photosensor G107
Solar cells in sunroof C20
System layoutControl unit with display
in dash panel insert J285
MOST busFront information display and
operating unit control unit J523
Rear right footwell heater
element Z43 Rear left footwell heater
element Z42 Fresh-air blower control unit
J126 with fresh-air blower V2Diagnosis CAN
Data bus diagnostic
interface J533
Sunroof electronics
control unit J528 Humidity
sender G355
Humidity sender
heater N340
Climatronic
control unit J255
Convenience CAN
Additional heater
control unit J364 Rear Climatronic control
and display unit E265Energy management
control unit J644Drive system CANEngine control unit J623Front information and display and
operating unit control unit J685
Radiator fan
control unit J293
Radiator fan V7
Air conditioning system compressor regulating valve N280
Flap control motors
V68, V71, V102, V107, V108, V109,
V110, V111, V113, V199, V200, V220,
V218, V219, V221
Coolant circulation pump V50
Left/right heat regulation valve N175/N176
Heated windscreen control unit J505
Heated windscreen Z2
Driver seat/front passenger seat ventilation control unit
J672/J673
Front left/front right heated seat Z45/Z46
Temperature sender for front left/front right seat
G344/G345
Page 81 of 96
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Heating/Air Conditioner
SSP282_103 Fresh-air intake duct
temperature sensor G89
Flap control
motor potentiometers
G92, G113, G135, G136,
G137, G138, G139, G140,
G143, G317, G318, G349,
G350, G351, G352
Air quality sensor G238
Left/right vent temperature
sender G150/G151
Centre vent temperature
sender G191
Evaporator outflow temperature
sender G263
High-pressure sender G65
Sunlight penetration
photosensor G107
Solar cells in sunroof C20
System layoutControl unit with display
in dash panel insert J285
MOST busFront information display and
operating unit control unit J523
Rear right footwell heater
element Z43 Rear left footwell heater
element Z42 Fresh-air blower control unit
J126 with fresh-air blower V2Diagnosis CAN
Data bus diagnostic
interface J533
Sunroof electronics
control unit J528 Humidity
sender G355
Humidity sender
heater N340
Climatronic
control unit J255
Convenience CAN
Additional heater
control unit J364 Rear Climatronic control
and display unit E265Energy management
control unit J644Drive system CANEngine control unit J623Front information and display and
operating unit control unit J685
Radiator fan
control unit J293
Radiator fan V7
Air conditioning system compressor regulating valve N280
Flap control motors
V68, V71, V102, V107, V108, V109,
V110, V111, V113, V199, V200, V220,
V218, V219, V221
Coolant circulation pump V50
Left/right heat regulation valve N175/N176
Heated windscreen control unit J505
Heated windscreen Z2
Driver seat/front passenger seat ventilation control unit
J672/J673
Front left/front right heated seat Z45/Z46
Temperature sender for front left/front right seat
G344/G345
Page 83 of 96
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Operation
Measurement is performed by way of a
special capacitor which can absorb water
vapour. The water absorbed produces a
change in the electrical properties and thus
the capacitance of the capacitor. The
capacitance measurement thus provides
information on the humidity level. The sender
electronics convert the measured capacitance
into a voltage signal.
Measurement of windscreen temperature
Physical principles
All bodies exchange heat with their
environment in the form of electromagnetic
radiation. This electromagnetic radiation can
include thermal radiation in the infrared
range, visible light or ultraviolet components.
The wavelength of the radiation emitted
depends on the temperature of the actual
body. A change in the temperature of the
body alters, for example, the infrared
component of the radiation emitted. The
temperature of the body can be determined
in a non-contacting manner by measuring the
infrared radiation emitted.
Operation
The infrared radiation emitted by a body
(windscreen) is measured by means of a
highly sensitive infrared radiation sensor.
A change in the temperature of the
windscreen also produces a change in the
infrared component of the thermal radiation
emitted by the windscreen. This is detected
by the sensor and converted by the sensor
electronics into a voltage signal.
SSP282_105
SSP282_106
Page 86 of 96
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J126 Fresh-air blower control unit
J255 Climatronic control unit
J528 Sunroof electronics control unit
J533 Data bus diagnostic interface
N175 Left heat regulation valve
N176 Right heat regulation valve
N280 Air conditioning system compressor
regulating valve
N340 Humidity sender heater
T16 16-pin connector
(diagnostic connection)
V2 Fresh-air blower
V42 Temperature sensor blower
V50 Coolant circulation pump
V68 Temperature flap control motor
V71 Air-flow flap control motor
V102 Central vent control motor
V107 Defroster flap control motor
V108 Left footwell flap control motor
V109 Right footwell flap control motor
V110 Left central vent control motor
V111 Right centre vent control motor
V113 Air-recirculation flap control motor
V199 Front right defroster/chest vent
shutoff flap control motor
V200 Front left defroster/chest vent
shutoff flap control motor
V220 Rear left vent warm/cold flap
control motor
V221 Rear right vent warm/cold flap
control motor
Z42 Rear left footwell heater element
Z43 Rear right footwell heater element
Z45 Front left heated seat
Z46 Front right heated seat
Block diagram for
front air conditioner
Key
C20 Solar cells
G56 Dash panel temperature sensor
G65 High-pressure sender
G89 Fresh-air intake duct temperature
sensor
G92 Temperature flap control motor
potentiometer
G107 Sunlight penetration photosensor
G113 Air-flow flap control motor
potentiometer
G135 Defrost flap control motor
potentiometer
G136 Left central vent control motor
potentiometer
G137 Right central vent control motor
potentiometer
G138 Central vent control motor
potentiometer
G139 Left footwell flap control motor
potentiometer
G140 Right footwell flap control motor
potentiometer
G143 Air recirculation flap control motor
potentiometer
G150 Left vent temperature sender
G151 Right vent temperature sender
G191 Centre vent temperature sender
G238 Air quality sensor
G263 Evaporator outflow temperature
sender
G317 Front right defroster/
chest vent shutoff flap
control motor potentiometer
G318 Front left defroster/
chest vent shutoff flap
control motor potentiometer
G344 Temperature sender for front left seat
G345 Temperature sender for front
right seat
G347 Centre left vent sensor
G348 Centre right vent sensor
G351 Rear left vent warm/cold
control motor potentiometer
G352 Rear right vent warm/cold
control motor potentiometer
G355 Humidity sender
Heating/Air Conditioner
Page 89 of 96
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Key
E265 Rear Climatronic control and display
unit
G94 Rear left seat temperature sensor
G95 Rear right seat temperature sensor
G177 Driver side rear seat occupied sensor
G178 Front passenger side rear seat
occupied sensor
G349 Positioning motor potentiometer
for rear left vent
G350 Positioning motor potentiometer
for rear right vent
G426 Driver side rear seat
temperature sensor
G427 Passenger side rear seat
temperature sensor
J533 Data bus diagnostic interface
J674 Driver side rear seat ventilation
control unit
J675 Front passenger side rear seat
ventilation control unit
T16 16-pin connector
(diagnostic connection)
V218 Rear left vent control
motor
V219 Rear right vent control
motor
V270 Rear right seat fan
V271 Rear left seat fan
V272 Rear right seat backrest fan
V273 Rear left seat backrest fan
Z10 Left heated rear seat
Z11 Left heated rear seat backrest
Z12 Right heated rear seat
Z13 Right heated rear seat backrest Colour code
= Input signal
= Output signal
= Positive supply
= Earth
= Convenience CAN High
= Convenience CAN Low
= LIN bus
Z13V272MM
V270
SSP282_115