Audi Workshop Service and Repair Manuals

Checking Climatronic control unit -J255- and air recirculation flap control motor -V113-   Note Depending on the operating unit, Climatronic control unit -J255-, the air recirculation flap control motor -V113- on vehicles manufactured in 2010 may also be displayed as fresh air/recirculated air, air flow flap control motor -V425- or fresh air and air recirculation flap control motor -V154- → Vehicle diagnostic tester, „Guided fault-finding“ function. Special tools and workshop equipment required t  Vehicle diagnostic tester t  Voltage tester -V.A.G 1527 B-

Sequence of operations –  Remove the glove compartment → Rep. gr.68. –  Switch on the ignition. –  Check operation of the control motor by way of „Read measured values“ in the „Guided fault-finding“ function → Vehicle diagnostic tester. –  Set the rotary air distribution switch -5- to „Dash panel vents“. –  Fresh air/air recirculation button -4- not pressed. l  Fresh air mode - the lamp in the button does not light.

l  Air recirculation flap control motor -V113- set to „Fresh air mode“ - fresh air flap -1- in „Open“ position. l  Air recirculation flap closed.   Note This illustration shows the fresh air flap -1- with the plenum chamber cover removed.

–  At the control motor -A- use the voltage tester -V.A.G 1527 B- and test leads from the adapter set -V.A.G 1594C- to connect contacts „5“ and „6“ of the connector -B-.   Note t  Leave the connector plugged in. t  Operation of the control motor is displayed in „Read measured values“ in the „Guided fault-finding“ function → Vehicle diagnostic tester. t  This illustration shows the connector on a manually controlled air conditioner control motor. Use is made of additional contacts in the connector on vehicles with an automatically controlled air conditioner → Current flow diagrams, Electrical fault finding and Fitting locations. t  The control motor connections are interchanged on right-hand drive vehicles → Current flow diagrams, Electrical fault finding and Fitting locations.

–  Press the fresh air/air recirculation button -4-. l  The lamp in the button lights. l  „Earth“ is briefly applied to contact „5“ and „Positive“ is briefly applied to contact „6“.

–  The air recirculation flap control motor -V113- and thus the air recirculation flap -1- move to the „air recirculation mode“ position. l  The air recirculation mode opening is opened.   Note Positive is only applied for a certain time after pressing the fresh-air/air recirculation button. Once this time has elapsed, the control motor is then only actuated with a specific duty cycle (lamp in voltage tester -V.A.G 1527B- only flashes briefly).

–  Press the fresh air/air recirculation button -4-. l  The lamp in the button goes out.   Note On pressing the fresh air/air recirculation button, the control unit alters the power supply to the control motor (positive and earth are interchanged). l  „Earth“ is briefly applied to contact „6“ and „Positive“ is briefly applied to contact „5“.

–  The air recirculation flap control motor -V113- and thus the air recirculation flap -1- move to the „fresh-air mode“ position. l  The air recirculation mode opening is closed.   Note The control motor connections are interchanged on right-hand drive vehicles → Current flow diagrams, Electrical fault finding and Fitting locations. If this test does not reveal any problems with actuation of the air recirculation flap control motor -V113- and the flap does not move properly: –  Check the freedom of movement of the fresh-air/air recirculation flap. –  Replace -V113- → Chapter. If actuation and thus operation of the air recirculation flap control motor -V113- are not OK –  Check the electronics in the Climatronic control unit -J255- and actuation of the air recirculation flap control motor -V113- in the „Guided fault-finding“ function → Vehicle diagnostic tester. –  Check the wiring between the Climatronic control unit -J255- and -V113- for open circuit or short circuit → Current flow diagrams, Electrical fault finding and Fitting locations. –  Check the power supply and earth connection to -J255-. –  Replace the Climatronic control unit -J255- → Chapter. If operation of the fresh-air/air recirculation flap is OK and the windows mist up, check the following: –  Contamination of dust and pollen filter → Chapter. –  Forced air extraction from passenger compartment → Chapter. –  Ingress of water into passenger compartment → Chapter. –  Fresh-air intake from plenum chamber and plenum chamber water drain → Chapter. –  Seals between individual fresh-air intake components and vehicle for damage and leaks. –  Actuation of air conditioner compressor regulating valve -N280- and operation of air conditioner → Chapter (checking cooling output).