| Removing and installing air conditioner operating and display unit, Climatronic control unit -J255- |
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| Removing and installing air conditioner operating and display unit, Climatronic control unit -J255- → Chapter |
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| When replacing an air conditioner operating and display unit, Climatronic control unit -J255-, attention must be paid to the exact assignment. Different versions for vehicles with air conditioner of „Basic“ or „Deluxe“ type, for left or right-hand drive vehicles, with or without seat heating and/or ventilation button etc. → Electronic parts catalogue. |
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| The seat heating and ventilation settings are made on the air conditioner operating and display unit, Climatronic control unit -J255-. These settings are transmitted via the data bus to the onboard supply control unit -J519-. The specified temperatures for the various seat heating and ventilation settings are stored in -J519-. Depending on the version of -J519- and the vehicle production period, the specified temperature for the seat heating and seat ventilation may therefore differ in spite of identical settings on the air conditioner operating and display unit, Climatronic control unit -J255- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 (for -J519-). |
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| If a new air conditioner operating and display unit, Climatronic control unit -J255- has been installed and basic setting not performed, air conditioner control action is restricted and this is displayed as a fault in the event recorder. After installing the air conditioner operating and display unit, Climatronic control unit -J255-, air conditioner basic setting is therefore to be implemented in the specified manner → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
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| The buttons, display and rotary controls of the air conditioner operating and display unit, Climatronic control unit -J255- are illuminated by light-emitting diodes (LEDs cannot be replaced). |
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| The function indicator lamps in the buttons and rotary controls as well as the rotary controls and buttons cannot be replaced separately. |
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| The functions selected are indicated by lighting of the function indicator lamps in the various buttons and rotary controls or in the display zones above these of the air conditioner operating and display unit, Climatronic control unit -J255-. |
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| Depending on the version of the air conditioner operating and display unit, Climatronic control unit -J255-, the functions currently selected may only be indicated on the display of the Multi Media Interface (MMI) (with the „Basic“ version) or on the display of the air conditioner operating and display unit, Climatronic control unit -J255- and on the display of the Multi Media Interface (MMI, with the „Deluxe“ version). The duration of the display can be set by way of the guided fault-finding „Adaption“ function of the air conditioner operating and display unit, Climatronic control unit -J255- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
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| Situations preventing activation of the driver/passenger seat heating or ventilation are stored as faults in the onboard supply control unit -J519-, the seat and steering column adjustment control unit with memory -J136- or the front passenger seat adjustment with memory control unit -J521- (depending on the vehicle model and equipment). On this vehicle, no information is currently transmitted via the data bus to the air conditioner operating and display unit, Climatronic control unit -J255- indicating that the event recorder in the corresponding control unit or in the convenience system central control unit -J393- has to be read out → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. In the event of problems with seat heating or ventilation, the first step should therefore always be to read out the event recorders of the control units which actuate the seat heating and ventilation. |
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| As of Model Year 2010 a start/stop system will be available as an optional extra for this vehicle in conjunction with certain engines. On vehicles with start/stop system, the stop function may be inhibited depending on the setting on the operating and display unit, Climatronic control unit -J255-. If „Defrost“ mode has been set for example, no stop function is possible or the stop function is terminated and the engine started as soon as this mode is selected. This also applies if the difference between the set specified temperature and the measured actual temperature exceeds a certain value in heating and cooling mode → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
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