Audi A6´05 323 Service page 70

Air conditioning
CAN-Convenience input siganls
Vehicle speed
Engine speed
Terminal 58d
Terminal 58s
Outside temperature
Engine temperature
Key information
Compressor off
Compressor power reduction
Auxiliary heating / auxiliary
ventilation
Radiator fan control
Engine overheating advance
warning
Consumer switch-off
Feedback
Rear window heating
70
The vehicle speed is used for the calculation "Setting the air congestion flap".
Start recognition: the program defines
"Engine off", if n < 200 rpm (below starter speed)
"Engine on", if n > 500 rpm is read.
Dimming value for the display and function lighting in %.
Dimming value for the button lighting in %.
Climatronic control unit J255 reads the temperature sensor for fresh air intake
duct G89 and puts this unfiltered on the CAN-Convenience. The display unit in
dash panel insert J285 reads temperature sensor G17 installed in the front of
the car and puts the lowest of the two outside temperatures read on the
CAN bus.
The engine electronics control unit J623 provides this value on the CAN bus.
The display unit in dash panel insert J285 transmits a key number between "1"
and "4" to Tm. 15. In Climatronic control unit J255, the respective driver-
specific settings for each key number are saved and recalled.
The last settings called up either in auxiliary heating mode or for incorrectly
received key numbers are saved in key number "0".
Switches off the compressor from the engine control unit.
Feedback message from engine electronics control unit J623.
If a CAN-compatible auxiliary heating is installed, Climatronic control
unit J255 is switched to auxiliary heating or auxiliary ventilation mode.
The decision whether to activate the auxiliary heating or the auxiliary
ventilation is made from Climatronic control unit J255.
Actual value of the radiator fan control from engine electronics control
unit J623.
If this message is transmitted on the CAN, the compressor with control
valve N280 must be switched off, regardless of the engine temperature.
Message from control unit for power management J644
Message on the successful activation of the rear window heating from control
unit for convenience system J393.