71
The temperature sensor for fresh air intake duct G89
in the plenum chamber, the middle vent
temperature sensor and the two vent temperature
senders, left G150 and right G151 are read as an
analogue voltage signal at Climatronic control
unit J255.
Furthermore, Climatronic control unit J255 receives
a total of ten feedback reports from the individual
flap positioning motors, the signals from sunlight
penetration photosensor G107, the signal from the
vent temperature sender for evaporator G263, as
well as the signal from the air quality sensor G238.
The compressor with control valve N280 is
controlled via a pulse width-modulated signal.
Analogue input and output signals
Depending on the equipment installed, an electric
additional air heater unit is installed in some diesel
versions of the new Audi A6´05. The operating
principle of the additional air heater is, as with the
Audi A6's predecessor, ceramic PTC resistors and
commutators which are heated by an electric
current and which generate this heat to the air
flowing through. The control of the additional air
heater is transferred to the respective engine
electronics control unit J623.
If additional heating is required, Climatronic control
unit J255 sends an appropriate message containing
the required output level to CAN-Convenience. This
is converted into a message for the CAN-Drive by
the diagnosis interface for data bus J533 and is
picked up by engine electronics control unit J623.
However, additional heating can only be provided if
the generator's capacity utilization is not too high.
Additional air heater unit
323_017
Diagnosis interface
for data bus
J533
Climatronic
J255
Engine
electronics 1
J623
Aux. heating
element
Z35
