| There are different versions of the operating and display unit, Climatronic control unit -J255-, the part number index must therefore be heeded → Spare parts catalogue |
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| With and without radio navigation system (or radio with large control panel) |
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| With and without switch for seat heating |
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| With Off button or with “Automatic air recirculation” button (vehicles with air quality sensor -G238- |
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| When replacing operating and display unit, Climatronic control unit -J255-, attention must be paid to exact assignment → Spare parts catalogue. |
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| After installing an operating and display unit, Climatronic control unit -J255-, perform air conditioner basic setting in the specified manner. |
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| If a new operating and display unit, Climatronic control unit -J255- has been fitted and basic setting not performed, the air conditioning system compressor regulating valve -N280- is not actuated and shutoff criterion “6” appears in measured value block “2” when performing the air conditioner self-diagnosis. |
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| The functions selected are indicated by lighting of LEDs in the various operating and display unit (Climatronic control unit -J255-) buttons. |
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| With this version of the operating and display unit, Climatronic control unit -J255-, the dash panel temperature sensor -G56-, the temperature sensor blower -V42- and the heated rear window switch (including potentiometers for heated seats) are integrated and cannot be replaced separately. |
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| Following replacement of the operating and display unit, Climatronic control unit -J255-: |
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| - Always encode operating and display unit, Climatronic control unit -J255-, |
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| - Always perform basic settings |
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| - Always interrogate fault memory . |
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| On this vehicle, the basic settings (e.g. country version, left-hand drive or right-hand drive) of the operating and display unit, Climatronic control unit -J255- are encoded by the control unit in dash panel insert -J285-. - Always data is transferred to the operating and display unit of the Climatronic control unit -J255-, via the convenience data bus system. The current valid coding is displayed in the measured value block. The direct entry of a code in the operating and display unit, Climatronic control unit -J255- is only provided for certain items of equipment (e.g. heated windscreen or sun roof with solar cells, etc.). → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → Engine, mechanics; Rep. Gr.01 |
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| The unit (°C or °F) for the temperature display of the operating and display unit, Climatronic control unit -J255- is transmitted by the control unit in dash panel insert -J285- and is determined by the code entered in this. |
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| The unit used for the display can be switched by simultaneously pressing the “Air recirculation mode” and “Temperature +” buttons for the left side for more than 2 seconds. |
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| The operating and display unit, Climatronic control unit -J255- then transmits the ambient temperature with the altered unit to the control unit in dash panel insert -J285-. The control unit in dash panel insert -J285- adopts this change. The same unit is used for the display in the operating and display unit, Climatronic control unit -J255- and the ambient temperature display in the dash panel insert. |
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| Switching of the unit used for the display in the operating and display unit, Climatronic control unit -J255- applies to all ignition keys. |
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| - Controlling of the temperature range, the minimum temperature that can be set is 16° C. → Spare parts catalogue |
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| If the operating and display unit, Climatronic control unit -J255- displays a number, interrogate the fault memory of the operating and display unit, Climatronic control unit -J255- (the number “60” for example indicates a fault at the temperature sensor blower -V42-). If the display of the operating and display unit, Climatronic control unit -J255- flashes and no fault is displayed in the fault memory (e.g. with display “09”), there is a fault in the electronics of the operating and display unit, Climatronic control unit -J255-. |
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