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Air conditioning
Vehicle speed The vehicle speed is used for the calculation "Setting the air congestion flap".
Engine speed Start recognition: the program defines
"Engine off", if n < 200 rpm (below starter speed)
"Engine on", if n > 500 rpm is read.
Term i nal 5 8 d Dimming value for the display and function lighting in %.
Term i nal 5 8 s Dimming value for the button lighting in %.
Outside temperature 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.
Engine temperature The engine electronics control unit J623 provides this value on the CAN bus.
Key information 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".
Compressor off Switches off the compressor from the engine control unit.
Compressor power reduction Feedback message from engine electronics control unit J623.
Auxiliary heating / auxiliary
ventilation
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.
Radiator fan control Actual value of the radiator fan control from engine electronics control
unit J623.
Engine overheating advance
warning
If this message is transmitted on the CAN, the compressor with control
valve N280 must be switched off, regardless of the engine temperature.
Consumer switch-off Message from control unit for power management J644
Feedback
Rear window heating
Message on the successful activation of the rear window heating from control
unit for convenience system J393.
CAN-Convenience input siganls
