Instructions. If there is a fault in the climate control system, read the fault memory of the climate control and display panel, Climatronic control unit -J255-. If an indication to read the fault memory on another control unit is indicated, the fault memory of this control unit must also be read (e.g. onboard power supply control unit -J519-, convenience system central control unit -J393-), certain climate elements. installations (e.g. compressor control valve -N280-, refrigerant temperature and pressure sender -G395-) The used and climate, settings, used Climatronic displays -J255- are no longer directly controlled / their measured values are no longer directly processed by the used and climate, settings, used Climatronic displays -J255-. If the fault is not displayed, the measured value block of the climate control and display panel, settings, Climatronic control unit-J255- can be read and the faulty component can be controlled using the function Diagnostics of actuators. In this repair manual the function "electrical equipment check" not described. When conducting email checks using the function "Geluehrte Fehlersuche/guided troubleshooting" You can find instructions on the functions to be tested. The temperature-dependent resistance values of the different temperature sensors are presented in tables that can be called up using the function. Description email Checking various servomotors is contained in the Guided Troubleshooting section.
Carry out the following work after completing the repair work using diagnostics. of the VAS 5051 complex in the function: interrogate the fault memory of the climate control and display module, settings, Climatronic control unit -J255- and, if necessary, erase the displayed faults. Check coding of climate control and display panel, settings, control unit for Climatronic -J255-. Check adaptation of climate control and display panel, settings, control unit for Climatronic -J255-. Carry out basic climate control settings.
Complex "1" components and parts on the left side 1. Left seat (driver's seat) with parts for heating and ventilation of seat heating (Front left seat temperature sensor -G344-, heated front left seat -Z45-) and seat ventilation (control unit and different fans). Heated and ventilated seats are not installed in all vehicles (additional equipment). The seat heating and ventilation are adjusted on the climate control and display unit, settings, Climatronic control unit -J255-. The control of seat heating and ventilation is displayed in the measured value block of the climate control and display panel, settings, Climatronic control unit -J255-. Seat heating and ventilation are controlled depending on the equipment and version of the vehicle, through different control units (for -J519-, -L 36- and -J521-, depending on vehicle). If conditions arise in which the heating or ventilation of the driver's or front passenger's seats cannot be switched on, this fact is stored as an error in the onboard power supply control unit -J519-, in the seat and steering column adjustment control unit with memory function -L 36- Or in the front passenger seat adjustment control unit with memory function -J521- (depends on the model and set. car). For this type of vehicle, the data bus does not currently send information to the Climatronic control unit -J255- that must be read from the fault memory in the relevant control unit or in the convenience system central control unit -J393-. Therefore, first, if there are complaints about seat heating or ventilation, clear the fault memory of the control units that control seat heating and ventilation. The climate control and display unit, Climatronic control unit -J255- sets the level of seat heating and ventilation and transmits this setting via the data bus system to the onboard power supply control unit -J519-. The set temperatures for the different levels of seat heating and ventilation are stored in the onboard power supply control unit -J519-. Therefore, depending on the version -J519- and the production date of the vehicle, with the same setting on the climate control and display unit, settings, Climatronic control unit -J255-, the set temperature for seat heating and ventilation may be different (for -J519-); 2. Steam trap on the left (driver's side); 3. Throttle valve. Kick-Down compressor shutdown (via air conditioning compressor control valve -N280-) occurs at the request of the engine control unit (data is transferred via a data bus system). The current status -N280- can be read out in the measured value block of the Climatronic control unit -J255- (climate. installation and, depending on the engine, the injection and ignition systems or the preheating and injection systems of diesel vehicles); 4. Diagnostic connection. Perform guided troubleshooting of climate control, installations; 5. Used on-board network -J519-. Various components, such as the heated rear window -Z1-, are controlled via the convenience system central control unit -J393-; 6. Temperature sender for front left air vent -G385- (only on vehicles with climate control. performance installation "Komfort"); 7. Defrost deflector / left side window; 8. Left front panel deflector. Remove and install the front panel deflector; 9. Used with indicator panel on instrument panel -J285-. With outside temperature sensor -G106- in the driver information system (FIS). If there is a complaint about a high display value of the outside temperature sensor -G106- (due to too high measured value -G17-); 10. Display unit for front display and information control unit -J685-. MMI display. Various design and control options, depending on MMI version and set. car The MMI display shows the functions selected on the control and display unit, Climatronic control unit -J255 (and various additional climate functions, settings). Using the radio button -R- or the multimedia system control unit -E380- (depending on vehicle equipment) You can call up various additional climate functions, settings and change its settings. Ensure that the display and control unit, Climatronic control unit -J255- is correctly matched, coded and adapted to the front control and display unit -J523- /communication electronics control unit 1 -J794- (different versions, depending on the production date and set. car). If some climate functions are incorrectly matched, encoded or adapted. settings may not be displayed or selected on the MMI. Since the 2010 model year for this vehicle, the start/stop system is offered for certain engines as an additional option. set. On vehicles with a start/stop system, depending on the setting in the control and display panel, the Climatronic control unit -J255- prevents the stop function. If, for example, the operating mode is set "Defrost", the stop function is not available, or the stop function is interrupted and the engine starts when this operating mode is selected. The same is true when the set point in heating and cooling mode exceeds the difference between the set target temperature and the measured actual temperature. On vehicles with a start/stop system, depending on the equipment and design of the vehicle, an additional coolant pump for stop function. On vehicles with a start/stop system, only the control and display panel, Climatronic control unit -J255- with part number 8Т1 820 043 with index can be installed "AG"; 11. Humidity sensor -G355- (only on vehicles with climate control, version installation "Komfort"); 12. Radio receiver -R-. Depending on the vehicle's equipment, a multimedia system control unit -E380- may be installed instead of the radio -R-. Key "Sag" you can call up various additional climate and installation functions and change its settings; 13. Temperature sender fan -V42- and dash panel temperature sender -G56-. Installed in the climate control and display unit, settings, Climatronic control unit -J255-. The temperature sensor in the instrument panel -G56- is located in the air conditioning control and display unit, Climatronic control unit -J255- (cannot be replaced separately). If on a vehicle with climate control, installation version "Komfort" If the intermediate part, the air ducts to the rear interior vents and the air duct in the rear center console are installed incorrectly, then warm or cold air may escape through the connection point of the parts and affect climate control and settings. This air is drawn in by the temperature sensor fan -V42- and the measured value of the temperature sensor in the instrument cluster -G56- differs from the actual temperature in the passenger compartment; 14. Control and display module, Climatronic control unit -J255- Variant "Basis". Various options (for vehicles with or without heated seats, left-hand drive or right-hand drive, depending on the production date and set. car). The temperature sensor in the instrument panel -G56- is located in the air conditioning control and display unit, Climatronic control unit -J255- (cannot be replaced separately). The temperature sensor fan -V42- is installed in the climate control and display unit, settings, Climatronic control unit -J255- and cannot be changed separately. Guided fault finding for the Climatronic control unit -J255- must be carried out as described. Please also pay attention to the additional instructions on the climate control and display panel. Keys and toggle switches are illuminated using LEDs (LED), which cannot be replaced separately. Indicator lamps in buttons and rotary switches, as well as rotary switches and buttons cannot be replaced separately; 15. Control and display module, Climatronic control unit -J255- Variant "Komfort". Various options (for vehicles with or without heated/ventilated seats, depending on the production date and set. car). Temperature sender -G56- is integrated in the control and display module, Climatronic control unit -J255- (cannot be replaced separately). The temperature sensor fan -V42- is installed in the climate control and display unit, settings, Climatronic control unit -J255- and cannot be changed separately. Guided fault finding of the control and display unit Climatronic control unit -J255- must be carried out as described in the section. Please also note the additional information on the climate control and display panel, settings, control unit for Climatronic -J255-. Various buttons, display fields and rotary switches are illuminated using LEDs (LED), which cannot be replaced separately. Indicator lamps in pushbuttons and rotary switches, as well as rotary switches and pushbuttons, cannot be replaced separately. Make sure that the control and display unit, Climatronic control unit -J255- is correctly matched, coded and adapted to the front control and display unit -J523-/communication electronics control unit 1 -J794-. If the matching, coding or adaptation is incorrect, some climate functions and settings may not be displayed or selected on the MMI display. Used and display -J255- with number 8Т1 820 043 before index "S" are installed on vehicles with a used front and display -J523-. Used and display -J255- with index number 8Т1 820 043 "T" Installed on vehicles with used communication electronics 1 -J794-. To display the functioning and select various functions, it is necessary to carry out coding and adaptation in accordance with the vehicle configuration; 16. Used multimedia system -E380-. Depending on the vehicle's equipment, a radio -R- may be installed instead of the multimedia system control unit -E380-. Key "Sag" You can call up various additional climate and settings functions and change its settings. In order for different climate functions and settings to be selected on the -E380- and displayed on the display panel of the front control and display unit -J685-, the correct version of the control and display unit, the Climatronic control unit -J255- must be installed and coded and adapted correctly
Complex "2" components and parts on the right side
I 1. Defrost deflector/windshield; 2. Solar radiation intensity photosensor -G107-; 3. Indirect ventilation deflector / middle speaker cover in the front panel. The indirect ventilation deflector is installed only on vehicles with climate control system option "Komfort". On vehicles with climate control. performance installation "Basis" the cover is installed and the hole in the air conditioner is closed (various versions of the air conditioner and air duct under the front panel); 4. Air conditioner evaporator and mounting parts. Various designs depending on version and set. car Cleaning the air conditioner evaporator using the ultrasonic air conditioner cleaner -VAS 6189-; 5. Instrument panel deflector in the center left; 6. Front panel deflector in the center right; 7. Defrost deflector / right side window; 8. Right front panel deflector; 9. Microfilter (with or without activated carbon filter element). Observe replacement intervals. Various designs depending on version and set. a/m; 10. Temperature sender for front right air vent -G386- (only on vehicles with climate control, version installation "Komfort"); 11. Condensate drain on the right (passenger side); 12. Right seat (front passenger seat) with parts for heating and ventilation of seat heating (Front right seat temperature sensor -G345-, heated front right seat -Z46-) and seat ventilation (control unit and different fans). Heated and ventilated seats are not installed in all vehicles (additional equipment). The seat heating and ventilation are adjusted on the climate control and display unit, settings, Climatronic control unit -J255-. The control of seat heating and ventilation is displayed in the measured value block of the climate control and display panel. installation, Climatronic control unit -J255-verification: diagnost. complex VAS 5051 in function "Guided troubleshooting". Depending on the equipment and version of the vehicle, seat heating and ventilation are controlled via different control units (for -J519-, -J136- and -J521-, depending on vehicle). If conditions arise in which the heating or ventilation of the driver's or front passenger's seats cannot be switched on, this fact is stored as an error in the onboard power supply control unit -J519-, in the seat and steering column adjustment control unit with memory function -L 36- Or in the front passenger seat adjustment control unit with memory function -J521- (depends on the model and set. car). For this type of vehicle, the data bus does not currently send information to the Climatronic control unit -J255- that must be read from the fault memory in the relevant control unit or in the convenience system central control unit -J393-. Therefore, first, if there are complaints about seat heating or ventilation, clear the fault memory of the control units that control seat heating and ventilation. Climate control and display unit. setting, the Climatronic control unit -J255- sets the level of seat heating and ventilation, this setting is transmitted via the data bus system to the onboard power supply control unit -J519-. The set temperatures for the different levels of seat heating and ventilation are stored in -J519-. Therefore, depending on the version -J519- and the date of manufacture of the vehicle, with the same setting on the climate control and display unit, settings, Climatronic control unit - J255-, the set temperature for seat heating and ventilation may be different (for onboard power supply control unit -J519-); 13. Rear center console deflector. Installed only with climate control, installation version "Komfort" (with climate control, performance installation "Basis" the hole in the center console is closed); 14. Rear temperature selection potentiometer -G538-. Installed only with climate control, installation version "Komfort" (with climate control, performance installation "Basis" the hole in the center console is closed). Temperature selection potentiometer, rear -G538- is part of the air vent and cannot be replaced separately
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