Audi Q7: A/C System Control and Regulation Components in Vehicle Interior

A/C System Control and Regulation Information

  Note

• Depending on vehicle equipment, there are different versions of the A/C system for the Audi Q7. Make sure to use the correct version and pay attention to the allocation of different components. Refer to → Chapter "A/C System Versions" and Parts Catalog.
• If there is a malfunction in the A/C system, first check the DTC memory for the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265- on a "High" A/C system). Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function. If a message appears to check the DTC memory of a different control module, also check the DTC memory of this control module (for example, the Vehicle Electrical System Control Module -J519-, the Comfort System Central Control Module -J393-). Certain A/C system components (such as the A/C Compressor Regulator Valve -N280-) are not directly activated by the Front A/C Display Control Head -E87- or their measured values are not directly evaluated by the Head Front A/C Display Control -E87-. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• If no malfunction is displayed, check the affected measured values of the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-) and activate any potentially problematic component using the "output diagnostic test mode" function. Refer to Vehicle Diagnostic Tester.
• The "electrical test" function is not described in this repair manual. Perform an electrical test via the "Guided Fault Finding" function. Information can also be found here on the functions that should be checked. Refer to Vehicle Diagnostic Tester.
• Certain A/C system functions can be switched on and off via the MMI (Multi Media Interface) in the "A/C system" function under the "Car"/"Vehicle" menu. The A/C system control can also be influenced via the presets in the MMI (Multi Media Interface) under the "A/C system" function in the "Car"/"Vehicle" menu. Therefore, check the preset in the MMI first in the case there is a problem with these components. Refer to Infotainment/MMI Operating Instructions.
• The temperature-dependent resistance values of the various temperature sensors are recorded in tables, which can be accessed using the "Guided Fault Finding" function. Refer to Vehicle Diagnostic Tester.
• The electrical test for the various actuators is described in Guided Fault Finding. Refer to Vehicle Diagnostic Tester.
• Repair work on refrigerant circuit. Refer to → Chapter "Refrigerant Circuit".
• Perform the following procedures after completing repairs:

- Check the DTC memory for the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-) and erase any malfunctions shown. Refer to Vehicle Diagnostic Tester.

- Check the coding of the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). Refer to Vehicle Diagnostic Tester.

- Check the adaptation of the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). Refer to Vehicle Diagnostic Tester.

- Initiate the basic setting for the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). Refer to Vehicle Diagnostic Tester.

Front A/C Display Control Head -E87- for A/C System Control and Regulation

  Note

• Depending on vehicle equipment, there are different versions of the A/C system for the Audi Q7. Make sure to use the correct version and pay attention to the allocation of different components. Refer to → Chapter "A/C System Versions" and Parts Catalog.
• The Front A/C Display Control Head -E87- cannot currently be interchanged in the usual way as the component protection is active. The component protection (anti-theft protection) can only be canceled by entering specific vehicle data. Refer to Vehicle Diagnostic Tester in "Guided Fault Finding" function.
• If a Front A/C Display Control Head -E87- with active component protection (anti-theft protection) is installed in a different vehicle, the functions necessary for vehicle safety can still be selected, but the convenience functions can no longer be selected. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• When replacing a Front A/C Display Control Head -E87-, ensure the correct allocation. There are different versions for vehicles with a "Low"Mid", "Mix" or "High" A/C system, with or without a button for seat heating and/or seat ventilation, etc. Refer to the Parts Catalog.
• Pressing the buttons on the Front A/C Display Control Head -E87- or the Rear A/C Display Control Head -E265- for an extended period of time (due to an object lying on them, for example) can result in a fault being stored in the DTC memory that indicates there are stuck buttons. If necessary, check the function of the buttons and erase the DTC memory if no malfunction is found.
• The setting for the seat heating and seat ventilation is adjusted on the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). This setting is transmitted via the data bus to the Vehicle Electrical System Control Module -J519-, for example. 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 the vehicle date of manufacture, the specified temperature for the seat heating and seat ventilation may differ with the same setting on the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function (for the Vehicle Electrical System Control Module -J519-). Refer to → Chapter "Seat Heating".
• If a new Front A/C Display Control Head -E87- (or Rear A/C Display Control Head -E265-) was installed and the basic setting was not performed, the A/C system regulation is limited and will be displayed as a malfunction in the DTC memory. After installing the Front A/C Display Control Head -E87- (or the Rear A/C Display Control Head -E265-), perform the A/C system basic setting as specified. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• Non-replaceable LEDs illuminate the buttons, the display and the knobs for the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-).
• The function indicator lamps in the buttons and in the knobs for the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-) as well as the knobs and buttons cannot be replaced separately.
• If an incorrect measurement is made by the temperature and sunlight infrared sensor installed in the Front A/C Display Control Head -E87-, check the trim of the Front A/C Display Control Head -E87-. The infrared sensor for temperature and sunlight must not be taped over or covered. Refer to Vehicle Diagnostic Tester function.
• The selected functions are indicated by the illumination of function indicator lamps in the various buttons, knobs or in the applicable display fields of the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-).
• Depending on the version and setting on the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-), the functions currently selected are indicated on the display of the Front A/C Display Control Head -E87- and on the display of the Multi Media Interface (MMI), or only on the display for the Front A/C Display Control Head -E87-. The display duration on the MMI display can be adjusted via the "adaptation" function in Guided Fault Finding for the Front A/C Display Control Head -E87-. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• If no malfunction is stored and a function of the Front A/C Display Control Head -E87- (or Rear A/C Display Control Head -E265-) is not available, check the adaptation of the Front A/C Display Control Head -E87- (and the Rear A/C Display Control Head -E265-). The function may be switched off due to a setting. If necessary, reset the adaptations in all adaptation channels to the manufacturer setting. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• If there is a condition where the heating or ventilation for the driver or front passenger seat cannot be switched on, it is stored as a malfunction in the Vehicle Electrical System Control Module -J519- or the Front A/C Display Control Head -E87- (depending on the vehicle version and vehicle equipment). Currently for this vehicle, the information that indicates that the DTC memory in the respective control module or Comfort System Central Control Module -J393- must be checked, is not always sent to the Front A/C Display Control Head -E87- via the data bus. Refer to 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.
• This vehicle has a Start/Stop System for specific engines as optional equipment. For vehicles with a Start/Stop System, the Stop function is prevented depending on the setting on the Front A/C Display Control Head -E87-. If, for example, "defrost" mode is selected, the Stop function is not possible or is canceled and the engine is started as soon as this mode is selected. The same also applies if the difference between the selected specified temperature and the measured actual temperature exceeds a certain value in heating and cooling mode. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• Certain A/C system functions can be switched on and off via the MMI (Multi Media Interface) in the "A/C system" function under the "Car"/"Vehicle" menu. The A/C system control can also be influenced via the presets in the MMI (Multi Media Interface) under the "A/C system" function in the "Car"/"Vehicle" menu. Therefore, check the preset in the MMI first in the case there is a problem with these components. Refer to Infotainment/MMI Operating Instructions.

Vehicles with Parking Heater

• Make sure the Front A/C Display Control Head -E87- is correctly allocated to the remote control hand-held transmitter and to the Parking Heater Radio Receiver -R64-. There are different versions of the remote control hand-held transmitter and Parking Heater Radio Receiver -R64-. Refer to the Parts Catalog and Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• Depending on the version of the Front A/C Display Control Head -E87-, additional parking heater functions may be controlled. For more information. Refer to the Operating Instructions and Infotainment/MMI Operating Instructions.

Vehicles with a high-voltage system (hybrid vehicles)

• So that the necessary functions of the Front A/C Display Control Head -E87- can be performed on vehicles with a high-voltage system, only a Front A/C Display Control Head -E87- may be installed on these vehicles that are equipped for it. Refer to the Parts Catalog and use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

  Note

At the start of production, vehicles with a high-voltage system are only being offered with an A/C system with a rear air distribution housing (without a rear heater and A/C unit).

After replacing the Front A/C Display Control Head -E87-, always perform the following procedures. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

- Check the coding.

- Perform the basic setting.

- If necessary, check the adaption.

- Check the DTC memory and delete any displayed entries.

• Front A/C Display Control Head -E87- of A/C System, Removing and installing. Refer to → Chapter "Front A/C Display Control Head -E87-, Removing and Installing".

Rear A/C Display Control Head -E265- for A/C System Control and Regulation

  Note

• Depending on vehicle equipment, there are different versions of the A/C system for the Audi Q7. Make sure to use the correct version and pay attention to the allocation of different components. Refer to → Chapter "A/C System Versions" and Parts Catalog.
• Pressing the buttons on the Front A/C Display Control Head -E87- or the Rear A/C Display Control Head -E265- for an extended period of time (due to an object lying on them, for example), can result in a fault being stored in the DTC memory that indicates there are stuck buttons. If necessary, check the function of the buttons and erase the DTC memory if no malfunction is found.
• There are different versions of the Rear A/C Display Control Head -E265-. Therefore, when replacing a Rear A/C Display Control Head -E265-, ensure the correct allocation (for vehicles with a "Mid", "Mix" or "High" A/C system; for vehicles with or without seat heating and/or seat ventilation buttons, etc.). Refer to the Parts Catalog.
• For the Rear A/C Display Control Head -E265-, the "component protection" function is currently not active (introduction of this function is not yet finalized). Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• The LEDs in the various buttons of the Rear A/C Display Control Head -E265- illuminate when functions are selected.
• The display fields and control buttons of the Rear A/C Display Control Head -E265- are illuminated by LEDs (these LEDs cannot be replaced).
• If a new Rear A/C Display Control Head -E265- was installed and the basic setting was not performed (only for vehicles with a "High" A/C system), the A/C system regulation is limited and it is displayed in the DTC memory as a malfunction. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• After replacing the Front A/C Display Control Head -E87- and / or the Rear A/C Display Control Head -E265-, always perform the basic setting, check the adaptation and check the A/C system DTC memory. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
• Certain A/C system functions can be switched on and off via the MMI (Multi Media Interface) in the "A/C system" function under the "Car"/"Vehicle" menu. The A/C system control can also be influenced via the presets in the MMI (Multi Media Interface) under the "A/C system" function in the "Car"/"Vehicle" menu. Therefore, check the preset in the MMI first in the case there is a problem with these components. Refer to Infotainment/MMI Operating Instructions.
• At the start of production, only a Rear A/C Display Control Head -E265--A- was installed on vehicles with a rear heater and A/C unit. For vehicles without a rear heater and A/C unit (with a rear air distribution housing), a different version of the Rear A/C Display Control Head -E265--B- is installed. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function and refer to the Parts Catalog.
• This illustration shows both versions of the Rear A/C Display Control Head -E265-, each with buttons for activating the rear seat heating and ventilation. Ensure the correct allocation to the vehicle and to the Front A/C Display Control Head -E87-. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" function and refer to the Parts Catalog.

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