Main Wiring Diagram For A/C System Actuators

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NOTE:

Revised A/C units are gradually being installed from MY 2012 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other actuators are also being installed. The actuator different versions can currently be installed on both A/C unit versions (interchanging is currently permitted). Using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

On this vehicle, the different actuators (-A- through -N-) on the A/C unit are adapted and activated via a data wire. The different actuators (-A- through -N-) are connected in sequence to the Climatronic Control Module -J255- A/C display and control head via this data wire (LIN Bus). If there is a malfunction on one actuator or in the wiring, this malfunction can lead to different malfunction entries with different malfunction types, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function and the appropriate SYSTEM WIRING DIAGRAM.

Fig 1: A/C Control Motor Block Diagram

Courtesy of AUDI OF AMERICA, LLC

The number of actuators on the A/C unit depends on the A/C system version (on the "Basis" A/C system there are six actuators, and on the "Convenience" A/C system there are 10 actuators). Refer to appropriate SYSTEM WIRING DIAGRAM.

The sequence of the actuators in the wiring depends on the A/C version ("Basis" or "Convenience" and on the vehicle version. Refer to appropriate SYSTEM WIRING DIAGRAM. On vehicles equipped with the "Convenience" A/C system, the Left Temperature Door Motor -V158- is installed, for example, at position -A-. On vehicles with the "Basis" A/C system, the Temperature Regulator Door Motor -V68- is installed at position -A-. Refer to appropriate SYSTEM WIRING DIAGRAM.

Dependent on the operating condition or the function of the A/C system Guided Fault Finding in which a malfunction appears, the effect of the malfunction and the type of malfunction stored in the DTC memory is different, using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

If there is a malfunction in the actuators sequence (two or more terminals or actuators were interchanged while being installed)

-- If these actuators were improperly adapted during the basic setting and the activation of the doors is incorrect (incorrect assignment)

-- Depending on the adjustment range for this actuator, an incorrect end stop is recognized during the basic setting and this is stored as a malfunction in the event memory, and the basic setting is terminated.

-- If the wrong door moves, then the air flow direction is incorrect. This is not always recognized as a fault depending on the adjustment range of the actuator. Always mark all connectors before disconnecting them and perform a basic setting after connecting them.

If there is a malfunction in normal A/C system operation, then the following DTC memory entries can result, depending on the type of malfunction.

-- If there is a malfunction in the positive or ground connection to an actuator, then this actuator can no longer exchange information with the Climatronic Control Module -J255- A/C display and control head and this actuator will store this in the DTC memory.

-- If there is a malfunction in the data wire to an actuator (for example, an interruption in the connector to the contact "2" of the actuator -B-), then this actuator and all the connected actuators (-C- through -N-) in the sequence switching after this actuator can no longer exchange information with the Climatronic Control Module -J255- A/C display and control head; this actuator as well as all the other connected actuators will be stored in the DTC memory.

-- If a malfunction occurs in the actuator electronics (for example, in actuator -B-), the actuator -B- can possibly still exchange information with the Climatronic Control Module -J255- A/C display and control head, depending on the type of malfunction, however all the actuators connected after this one (-C- through -N-) will be stored in the DTC memory.

If there is a malfunction during the basic setting of the A/C system, then the following malfunction entries can result, depending on the type of malfunction.

-- If there is a malfunction in the positive or ground connection to an actuator, (for example to actuator -B-), then this actuator cannot exchange information with the Climatronic Control Module -J255- A/C display and control head and it will not be recognized during the basic setting. During the basic setting, all the actuators from the last actuator beginning with -N- are re-allocated and re-assigned; this actuator is no longer in sequence. The Climatronic Control Module -J255- A/C display and control head recognizes that an actuator is missing and saves the first actuator in the sequence switching as missing (for example, on left-hand drive vehicles equipped with the "Convenience" A/C system, the Left Temperature Door Motor -V158-); moreover, the malfunction will display as "Automatic Addressing Malfunctioning" and possibly by certain actuators "Upper or Lower Values Exceeded".

-- If there is a malfunction in the data wire to an actuator (for example, an open circuit in the connector to contact "2" of actuator -C-), this actuator and all connected actuators in the sequence switching after this one can no longer exchange information with the Climatronic Control Module -J255- A/C display and control head, and these actuators are not recognized during the basic setting. During the basic setting, all the actuators from the last actuator beginning with -N- are re-allocated and re-assigned; these actuators are no longer in sequence. The Climatronic Control Module -J255- A/C display and control head recognizes that several actuators are missing (only actuators -B- -A- are recognized and incorrectly assigned and adapted as the Airflow Door Motor -V71- and Recirculation Door Motor -V113-). All other actuators (for example, on vehicles equipped with the "Convenience A/C unit" A/C system, from the Right Footwell Door Motor -V109- up to the Left Temperature Door Motor -V158-) are stored in the DTC memory as missing and the malfunction is displayed as "Automatic Addressing malfunctioning".

-- If a malfunction occurs in the actuator electronics or during the basic setting (for example, in actuator -C-), this actuator may still be able to exchange information with the Climatronic Control Module -J255- A/C display and control head, depending on the type of malfunction. However, no data can be exchanged with all actuators connected after this one (up to actuator -N-). The Climatronic Control Module -J255- A/C display and control head recognizes that several actuators are missing (only actuators -C- up to -A- are recognized and incorrectly assigned and adapted as Recirculation Door Motor -V113-, Airflow Door Motor -V71- and Right Footwell Door Motor -V109-). All other actuators (for example, on vehicles equipped with the "Convenience A/C unit" A/C system, from the Right Center Vent Motor -V111- up to the Left Temperature Door Motor -V158-) are stored in the DTC memory as missing and the malfunction is displayed as "Automatic Addressing malfunctioning".