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Home >> Audi >> 2012 >> Q5 2.0T >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> A/C Compressor >> Heating, Ventilation & Air Conditioning (1 Of 2) (As Of 06.2014) >> 87 Air Conditioning >> Overview - A/C System >> Overview - Components Inside Front Passenger Compartment >> Components on the Left Side

Components on the Left Side

Components on the Left Side 

Fig 1: Overview Of Components Inside Front Passenger Compartment - Left Side
GWWA87-10431Courtesy of AUDI OF AMERICA, LLC
  1. Left Seat (Driver Seat) with Seat Heating and Seat Ventilation Components
    • Seat heating components (Left Front Seat Temperature Sensor -G344-, Left Front Seat Heating Element -Z45-) and seat ventilation (control module and various blowers). Refer to SEAT VENTILATION CONTROL MODULE AND SEAT HEATING, REMOVING AND INSTALLING and OVERVIEW - SEAT HEATING ELEMENT .
    • The seat heating and seat ventilation are not installed in all vehicles (optional equipment).
    • The Climatronic Control Module -J255- A/C display and control head adjusts the seat heating and seat ventilation. The activation of the seat heating and seat ventilation is displayed in the measured values block of the Climatronic Control Module -J255- A/C display and control head. To check, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Different control modules activate the seat heating and the seat ventilation, depending on the vehicle equipment and version. Refer to FRONT SEAT HEATING AND VENTILATION , and using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. (for the Vehicle Electrical System Control Module -J519-, the Memory Seat/Steering Column Adjustment Control Module -J136- and the Front Passenger Memory Seat Control Module - J521-, depending on the vehicle).
    • Seating heating and ventilation, servicing. Refer to SEAT VENTILATION CONTROL MODULE AND SEAT HEATING, REMOVING AND INSTALLING and OVERVIEW - SEAT HEATING ELEMENT .
    • For information about seat heating and ventilation function. Refer to FRONT SEAT HEATING AND VENTILATION .
      NOTE:

      If there is a condition, where the heating or ventilation of the driver or passenger seat cannot be switched on, this will be stored as a malfunction in the Vehicle Electrical System Control Module -J519-, in the Memory Seat/Steering Column Adjustment Control Module -J136- or in Front Passenger Memory Seat Control Module -J521- (depending on the vehicle version and the vehicle equipment level). Currently no information is sent to the Climatronic Control Module -J255- A/C display and control head on this vehicle via the Data Bus system; the DTC memory must be read out in each control unit or in the Comfort System Central Control Module -J393-, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function. In the event of a complaint regarding seat heating or seat ventilation, first check the DTC memory of the control modules activating the seat heating and seat ventilation.

      The setting for the seat heating and ventilation is adjusted on the Climatronic Control Module -J255- A/C display and control head; this adjustment is transmitted to the Vehicle Electrical System Control Module -J519- via the Data Bus. The specified temperatures for the different seat heating and seat ventilation settings are stored in the Vehicle Electrical System Control Module -J519-. Depending on the version of the Vehicle Electrical System Control Module -J519- and on the vehicle date of manufacture, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic Control Module -J255- A/C display and control head, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function (for the Vehicle Electrical System Control Module -J519-).

  2. Left Condensation Water Drain (Driver Side)
  3. Accelerator Mechanism
    • The request to switch off the A/C compressor kick-down (via the A/C Compressor Regulator Valve -N280-) comes from the engine control module (the data is exchanged through the Data Bus). The actual activation of the A/C Compressor Regulator Valve -N280- can be read in the measured values block for the Climatronic Control Module -J255- A/C display and control head, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function (the A/C system and, depending on engine, the fuel injection and ignition system or the diesel direct injection and glow plug system).
  4. Diagnostic Connection
    • Perform the Guided Fault Finding for the A/C system, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
  5. Vehicle Electrical System Control Module -J519-
    • The A/C system activates different components, for example, the Rear Window Defogger -Z1- via the Comfort System Central Control Module -J393-. Refer to Electrical System and using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Removing and installing, checking. Refer to Electrical Equipment
  6. Left Front Upper Body Vent Temperature Sensor -G385-

    -- Installed only in the "Convenience" A/C system.

  7. Defroster Vent/Left Side Window
  8. Left Instrument Panel Vent
  9. Instrument Cluster Control Module -J285-
    • With Outside Air Temperature Display -G106- in the driver information system
    • If there is a complaint due to an excessive display value Outside Air Temperature Display -G106- (due to an excessive measured value of the Outside Air Temperature Sensor -G17-). Refer to Outside Air Temperature Sensor -G17-, REMOVING AND INSTALLING .
    • To check, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
  10. Front Information Display Control Head -J685-
    • Multi Media Interface (MMI) Display
    • Different versions and operation; depending on the version of the MMI ("Infotainment" or "Basis") and the vehicle equipment level. Refer to the Owner's Manual Infotainment/MMI.
    • Functions (and various additional A/C system functions) selected on the Climatronic Control Module -J255- display and control head are shown via the MMI display. Refer to Infotainment/MMI Operating Instructions.
    • Via the button "car" of the Radio -R- or the Multimedia System Control Head -E380- (depending on the vehicle equipment level), various additional functions of the A/C system can be started and their setting changed. Refer to the Infotainment/MMI operating instructions.
    • On the Audi A5 Coupe and Audi A4 from MY 2009, revised Climatronic Control Module -J255- display and control heads are being installed as a running change (this has been already done on the Audi Q5 since the start of production). refer to -item  14- . On vehicles with these display and control heads, and depending on the coding and adaptation, for example the display on the screen for the "MMI" (Multi Media Interface), when using the buttons and knobs, the display and control head no longer switches to "A/C system". The selected functions for the A/C system appear in the display sequentially (different versions), using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function, the Owner's Manual and "Infotainment/MMI" Operating Instructions.
      NOTE:

      Ensure the correct allocation, coding and adaptation for the Climatronic Control Module -J255- display and control head to the Front Information Display Control Head Control Module -J523- /Information Electronics Control Module 1 -J794- (different versions depending on the production period and vehicle equipment level). . If the allocation, coding and adaptation are incorrect, the A/C function cannot be displayed or selected in the MMI.

      From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with Start/Stop system, the Climatronic Control Module -J255- display and control head prevents the Stop function depending on the setting. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature exceeds a certain value, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      Vehicles with the Start/Stop System have an additional coolant pump for the Stop function depending on the vehicle equipment level and on the version of the vehicle. Refer to COOLANT PUMP/THERMOSTAT for CALB, COOLANT PUMP/THERMOSTAT for CPNB, COOLANT PUMP/THERMOSTAT for CTUC and CTUD, or COOLANT PUMP/THERMOSTAT for CAEB, CPMB, CPMA and CHJA, and using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      If the vehicle has a Start/Stop System, then only the Climatronic Control Module -J255- display and control heads may be installed with the part number 8T1 820 043 starting with index "AG" or with part number 8K_ 820 043. Refer to DISPLAY AND CONTROL HEAD LOCATION .

  11. Humidity Sensor -G355-
    • Removing and installing. Refer to Humidity Sensor -G355-, REMOVING AND INSTALLING .

      -- Not installed on all vehicles (depends on when the vehicle was manufactured and on the vehicle equipment).

    • To check, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
      NOTE:

      At the start of production, the Humidity Sensor -G355- was only installed on the "Convenience" A/C system.

      From MY 2012, the vehicle version was changed-over as a running change beginning with Audi A4 and Audi A5. Refer to DISPLAY AND CONTROL HEAD LOCATION . Vehicles with the "Basis" A/C system built after the changeover have a Humidity Sensor -G355-.

      The Comfort System Central Control Module -J393- or the Data Bus On Board Diagnostic Interface -J533- evaluates the measured value from the Humidity Sensor -G355- for vehicles manufactured before the changeover. The Vehicle Electrical System Control Module -J519- evaluates the measured value from the Humidity Sensor -G355- on vehicles manufactured from the product changeover. Refer to, Electrical Equipment and using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      Depending on time period of production (from MY 2012 as a running change) and vehicle version, the Humidity Sensor -G355- no longer operates as an individual part in the DTC memory. On these vehicles, the Rain/Light Recognition Sensor -G397- is displayed as the fault location in the event of a deviation on the Humidity Sensor -G355-.

  12. Radio -R-
    • Depending on the vehicle equipment level, a Multimedia System Control Head -E380- may be installed instead of the Radio -R-.
    • Using the "Car" button, various additional A/C system functions can be started and their setting changed. Refer to the Owner's Manual Infottainment/MMI
    • To check, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
  13. Interior Temperature Sensor Fan -V42- and Instrument Panel Temperature Sensor -G56-
    • Installed in the Climatronic Control Module -J255- A/C display and control head.
    • Interior Temperature Sensor Fan -V42-, removing and installing. Refer to INTERIOR TEMPERATURE SENSOR FAN, REMOVING AND INSTALLING .
    • The Instrument Panel Temperature Sensor -G56- is integrated in the Climatronic Control Module -J255- A/C display and control head and cannot be replaced separately.
      NOTE:

      On the "Convenience" A/C system, if the intermediate piece on the air guides to the rear footwell vents and on the air guide to the rear center console vents is installed incorrectly, warm or cold air can escape and influence the A/C system. This air is then taken in by the Interior Temperature Sensor Fan -V42- and the measured value from the Instrument Panel Temperature Sensor -G56- will be different from the actual temperature inside the passenger compartment.

  14. Climatronic Control Module -J255- Display and Control Head, "Basic" Version (See Fig 1)
    • There are different versions (for vehicles without or with seat heating, left- or right side steering, depending on the time of manufacture and vehicle equipment level). For allocation, refer to -item  15- .
    • Removing and installing. Refer to DISPLAY AND CONTROL HEAD, REMOVING AND INSTALLING .
    • The Instrument Panel Temperature Sensor -G56- is integrated in the Climatronic Control Module -J255- A/C display and control head (cannot be replaced separately).
    • The Interior Temperature Sensor Fan -V42- is installed in the Climatronic Control Module -J255- A/C display and control head, however it cannot be replaced individually. Refer to INTERIOR TEMPERATURE SENSOR FAN, REMOVING AND INSTALLING .
    • The Guided Fault Finding of the Climatronic Control Module -J255- display and control head is to be performed as described in Guided Fault Finding, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Also observe additional notes for the Climatronic Control Module -J255- A/C display and control head. Refer to NOTES ON DISPLAY AND CONTROL HEAD .
      NOTE:

      On the Audi A5 Coup e and Audi A4 from MY 2009, the Climatronic Control Module -J255- display and control heads with the part number 8T1 820 043 starting with the index "T" or are installed (on the Audi Q5 this was already installed since the start of production). Refer to -item  15-.

      From MY 2010, a Start/Stop System will be offered as an option for this vehicle with certain engines. Refer to -item  15-, and using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      If the vehicle has a Start/Stop System, then only the Climatronic Control Module -J255- display and control heads may be installed with the part number 8T1 820 043 starting with index "AG".

      NOTE:

      Updated Fresh Air Blower Control Module -J126-, Fresh Air Blower -V2-, Climatronic Control Module -J255- A/C display and control head, Vehicle Electrical System Control Module -J519-, Comfort System Central Control Module -J393-, Air Quality Sensor -G238- and A/C units are being installed as a running change from MY 2012 (depending on the vehicle version). Pay attention to the correct version and allocation of these components. Using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      If the allocation or adaptation of the Climatronic Control Module -J255- to the Fresh Air Blower Control Module -J126- (with the part number 8K0 820 521 or 8T0 820 521) is not according to the specification, then the Fresh Air Blower -V2- is not regulated by the Fresh Air Blower Control Module -J126-. There may not always be an entry in the DTC memory even though the activation of the Fresh Air Blower -V2- is not OK. Make sure the Climatronic Control Module -J255- is adapted correctly. Using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      At the start of production, the Humidity Sensor -G355- was only installed on the "Convenience" A/C system. Since the introduction of the Start/Stop System from MY 2010, the Humidity Sensor -G355- is also being installed in vehicles with the "Basis" A/C system and this optional equipment.

      The Comfort System Central Control Module -J393- or the Data Bus On Board Diagnostic Interface -J533- evaluates the measured value from the Humidity Sensor -G355- for vehicles manufactured before the version changeover (except for the Audi Q5 hybrid). The Vehicle Electrical System Control Module -J519- evaluates the measured value from the Humidity Sensor -G355- on vehicles manufactured from the product changeover (and on all Audi Q5 hybrids). Using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      Depending on time period of production (from MY 2012 as a running change) and vehicle version, the Humidity Sensor -G355- no longer operates as an individual part in the DTC memory. On these vehicles, the Rain/Light Recognition Sensor -G397- is displayed as the fault location in the event of a deviation on the Humidity Sensor -G355-.

      Different versions of the Humidity Sensor in Fresh Air intake Duct -G657- /Air Quality Sensor -G238- are being installed depending on the vehicle date of manufacture and A/C system version ("Basis" or "Convenience"). The "Basis" A/C system does not, for example, have a humidity sensor in the Humidity Sensor in Fresh Air intake Duct -G657- /Air Quality Sensor -G238- until the MY 2012 changeover. From MY 2012 it has a humidity sensor in Humidity Sensor in Fresh Air intake Duct -G657- without an Air Quality Sensor -G238- (black housing). From MY 2012, the "Convenience" A/C system has an Air Quality Sensor -G238- without a Humidity Sensor in Fresh Air intake Duct -G657-. From this change, a Humidity Sensor in Fresh Air intake Duct -G657- is installed with an Air Quality Sensor -G238- (brown housing).

      The Air Quality Sensor -G238- without the Humidity Sensor in Fresh Air intake Duct -G657- is only installed on vehicles with the "Convenience" A/C system (from the start of production up to the version changeover in MY 2012).

      From MY 2012, the vehicle version was changed-over as a running change beginning with Audi A4 and Audi A5. Refer to DISPLAY AND CONTROL HEAD LOCATION . Vehicles, built before the changeover and with the "Convenience" A/C system, have an Air Quality Sensor -G238- (not installed on the "Basis" version). For vehicles built since this changeover (and for the Audi Q5 Hybrid), a Humidity Sensor in Fresh Air intake Duct -G657- is installed on the "Basis" version and a Humidity Sensor in Fresh Air intake Duct -G657- with the Air Quality Sensor -G238- is installed on vehicles with the "Convenience" version.

      The buttons and knobs have LEDs that cannot be replaced individually.

      The function and indicator lamps in the buttons and in the knobs cannot be replaced separately.

  15. Climatronic Control Module -J255- Display and Control Head, "Convenience" Version (See Fig 1)
    • Different versions (for vehicles without or with heated seats/seat ventilation, left- or right side steering, depending on the time of manufacturer and equipment level), allocate correct components.
    • Removing and installing. Refer to DISPLAY AND CONTROL HEAD, REMOVING AND INSTALLING .
    • The Instrument Panel Temperature Sensor -G56- is integrated in the Climatronic Control Module -J255- display and control head (cannot be replaced separately).
    • The Interior Temperature Sensor Fan -V42- is installed in the Climatronic Control Module -J255- A/C display and control head, however it cannot be replaced individually. Refer to INTERIOR TEMPERATURE SENSOR FAN, REMOVING AND INSTALLING .
    • The Guided Fault Finding of the Climatronic Control Module -J255- display and control head is to be performed as described in Guided Fault Finding, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Also observe additional notes for the Climatronic Control Module -J255- A/C display and control head. Refer to NOTES ON DISPLAY AND CONTROL HEAD .
    • The buttons, displays and rotatory switches are lit with LEDs; they cannot be replaced individually
    • The function and indicator lamps in the buttons and in the dials cannot be replaced separately.
    • On the Audi A5 Coup e and Audi A4 from MY 2009, the Climatronic Control Module -J255- display and control heads with the part number 8T1 820 043 starting with the index "T" are installed (on the Audi Q5 this was already installed since the start of production). On vehicles with these display and control heads, and depending on the coding and adaptation, for example the display on the screen for the "MMI" (Multi Media Interface), when using the buttons and knobs, the display and control head no longer switches to "A/C system". The selected functions for the A/C system appear in the display sequentially, using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function, the "Infotainment/MMI" Operating Instructions and the Owner's Manual.
      NOTE:

      Pay attention to the correct allocation, coding and adaptation of the Climatronic Control Module -J255- display and control head to the Front Information Display Control Head Control Module -J523- /to the Information Electronics Control Module 1 -J794-. Using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. If the allocation, coding or adaptation are incorrect, the A/C system functions cannot be displayed or selected in the MMI.

      The Climatronic Control Module -J255- display and control heads with the part number 8T1 820 043 up to index "S" are installed on vehicles with a Front Information Display Control Head Control Module -J523-.

      The Climatronic Control Module -J255- display and control heads with the part number 8T1 820 043 beginning with index "T" may be installed on vehicles with an Information Electronics Control Module 1 -J794-. In order to be able to select and display the different functions, the coding and adaptation must be correct for the vehicle equipment level.

      Read the information regarding the vehicle updates from MY 2012, refer to -item  14-

  16. Multimedia System Control Head -E380-
    • Depending on the vehicle equipment level, a Radio -R- may be installed instead of the Multimedia System Control Head -E380-.
    • Using the "Car" button, various additional A/C system functions can be started and their setting changed. Refer to the Owner's Manual Infottainment/MMI
    • To check, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
    • In order for the various A/C system functions to be selected on the Multimedia System Control Head -E380- and displayed on the Front Information Display Control Head -J685-, the correct version of the Climatronic Control Module -J255- display and control head must be installed and coded correctly and adapted, refer to -item  15-.
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