Audi Workshop Service and Repair Manuals

Control elements actuated

Indicated on display	Specified function		Fault rectification
Air conditioning system compressor regulating valve -N280- (heed notes)	t  The air conditioning system compressor regulating valve -N280- is switched on and off at 5-second intervals. –  This causes the compressor to be switched on and off. –  The air conditioning system compressor regulating valve -N280- is actuated such that there is a current flow of approx. 0.65 ...0.8 A.		–  Eliminate compressor shutoff criterion → Chapter –  Check air conditioning system compressor regulating valve -N280- → Chapter.

Note t  At present, the air conditioning system compressor regulating valve -N280- is only actuated when the engine is not running. If the engine is running, this control element is not displayed during final control diagnosis (depending on version of operating and display unit, Climatronic control unit -J255-) by the vehicle diagnostic, testing and information system -VAS 5051A- and not actuated by the operating and display unit, Climatronic control unit -J255-. t  The regulating valve is installed in the compressor (the compressor can only be replaced at a specialist air conditioner workshop). → Air conditioner with refrigerant R134a t  The current flow with the air conditioning system compressor regulating valve -N280- activated can be measured for example using a current probe → Chapter. t  If there is a further compressor shutoff criterion in addition to compressor shutoff criterion “5 = Engine speed less than 300 rpm”, the air conditioning system compressor regulating valve -N280- is not actuated.

Indicated on display	Specified function		Fault rectification
Fresh air blower -V2-	t  Fresh air blower -V2- in operation –  The fresh air blower speed changes continuously within 5 to 8 seconds between 0% and 88% (100%) of the maximum speed		–  Check freedom of movement of fresh air blower -V2- –  Use current flow diagram to check positive and earth connection to fresh air blower control unit -J126- –  Check fresh air blower control unit -J126- → Chapter –  Use current flow diagram to check wiring between fresh air blower control unit -J126- and operating and display unit, Climatronic control unit -J255- –  Replace operating and display unit, Climatronic control unit -J255- → Chapter
CAUTION: Fan is switched on	Info display
	ATTENTION:
	After the → button is next pressed, the radiator fan(s) -V7- is/are switched on.

WARNING Keep hands out of radiator fan -V7- area.

Indicated on display	Specified function		Fault rectification
Radiator fan control unit -J293-, speed “1” + “2” (heed notes)	t  The operating and display unit, Climatronic control unit -J255- transmits the request for actuation of the radiator fan -V7- (via the data bus system) to the relevant engine control unit. Actuation changes constantly within approx. 10 to 30 seconds between 0% and 30 ... 100% of maximum speed (depending on engine control unit). –  By way of the radiator fan control unit -J293- and with the engine running, the relevant engine control unit switches the fan from 0% to 30 ... 100% of the radiator fan -V7- speed (depending on engine control unit). –  The radiator fan -V7- speed changes depending on actuation (from “Off” to the “maximum speed” requested by the engine control unit).		–  Interrogate fault memory of operating and display unit, Climatronic control unit -J255-. Faults should not be displayed → Chapter. –  Interrogate fault memory of relevant engine control unit and check actuation of radiator fan -V7- by engine control unit via radiator fan control unit -J293- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051, → Injection and ignition system; Rep. Gr.01 or → Diesel glow plug and injection system; Rep. Gr.01 –  Check power supply and earth connection to radiator fan control unit -J293- and to radiator fan -V7-. → Current flow diagrams, Electrical fault finding and Fitting locations

Note t  Start the engine if actuation of the radiator fan -V7- is to be checked. The relevant engine control unit only switches on the radiator fan(s) -V7- when the engine is running. t  Depending on the version of the operating and display unit, Climatronic control unit -J255-, the radiator fan is either switched on immediately in air conditioning mode when the compressor is activated or the radiator fan is only actuated on exceeding a pressure of approx. 9 bar in the refrigerant circuit. t  The request for activation of the radiator fan -V7- is transmitted via the convenience data bus system by the operating and display unit, Climatronic control unit -J255- to the control unit in dash panel insert -J285-. The control unit in dash panel insert -J285- (gateway) then transmits the request to the drive data bus system to which the relevant engine control unit is connected. By means of a square-wave signal, the engine control unit subsequently actuates the radiator fan control unit -J293- and the radiator fan control unit -J293- switches on the radiator fan(s) -V7-. t  Depending on the version of the operating and display unit, Climatronic control unit -J255-, the radiator fan -V7- is either actuated in speeds “1” and “2” in one test step or switching may be necessary for actuation of speed “2”.

Indicated on display	Specified function		Fault rectification
Temperature sensor blower -V42-	t  The temperature sensor blower -V42- is switched on and off at 5-second intervals. –  Installed in operating and display unit, Climatronic control unit -J255- –  Smoke is drawn in through the intake frame of the temperature sensor blower -V42-		–  Check for blockage of intake frame installed in operating and display unit, Climatronic control unit -J255- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  Use smoke for example to check operation of temperature sensor blower -V42- (hold smoke generator in front of intake frame installed in operating and display unit, Climatronic control unit -J255-). t  The temperature sensor blower -V42- is permanently installed in the operating and display unit, Climatronic control unit -J255- and cannot be replaced separately.

Indicated on display	Specified function		Fault rectification
Left temperature flap control motor -V158-	t  The left temperature flap control motor -V158- moves from stop to stop		–  Check freedom of movement of left temperature flap
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed –  The temperature of the air flowing out of the left dash panel vents changes (with warm engine)		–  Use current flow diagram to check wiring between left temperature flap control motor -V158- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check left temperature flap control motor -V158- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.
Right temperature flap control motor -V159-	t  The right temperature flap control motor -V159- moves from stop to stop		–  Check freedom of movement of right temperature flap
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed –  The temperature of the air flowing out of the right dash panel vents changes (with warm engine)		–  Use current flow diagram to check wiring between right temperature flap control motor -V159- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check right temperature flap control motor -V159- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Indicated on display	Specified function		Fault rectification
Central flap control motor -V70-	t  The central flap control motor -V70- moves from stop to stop		–  Check freedom of movement of central flap
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed –  The footwell/defroster flap is set to “Air to footwell” position –  The air distribution changes from footwell/defrost to dash panel vents		–  Use current flow diagram to check wiring between central flap control motor -V70- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check central flap control motor -V70- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.
Defroster flap control motor -V107-	t  The defroster flap control motor -V107- moves from stop to stop		–  Check freedom of movement of footwell/defroster flap
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed t  The central flap is closed (air to footwell/defroster flap) –  The air distribution changes from footwell to defrost (to windscreen)		–  Use current flow diagram to check wiring between defroster flap control motor -V107- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check defroster flap control motor -V107- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note Depending on the version of the operating and display unit, Climatronic control unit -J255-, the actuation sequence is different for the air flow flap control motor -V71- and the air recirculation flap control motor -V113- (on vehicles manufactured at the start of production, the air flow flap control motor -V71- is actuated first; on vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue the air recirculation flap control motor -V113- is actuated first).

Indicated on display	Specified function		Fault rectification
Air flow flap control motor -V71- –  Only for left-hand drive vehicles (refer to notes)	t  The air flow flap control motor -V71- moves from stop to stop		–  Check freedom of movement of air flow/fresh air flaps
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed t  The recirculated-air flap is closed. –  The air flow/fresh-air flaps open and close. –  The flow of air from the vents changes.		–  Use current flow diagram to check wiring between air flow flap control motor -V71- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check air flow flap control motor -V71- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  This control motor is only fitted on left-hand drive vehicles and is used to actuate the air flow/fresh-air flaps. t  Right-hand drive vehicles are not fitted with this control motor. If this control motor is displayed for a right-hand drive vehicle, check encoding of operating and display unit, Climatronic control unit -J255- (Reading measured value block, display group “019”) → Chapter.

Indicated on display	Specified function		Fault rectification
Air recirculation flap control motor -V113-	t  The air recirculation flap control motor -V113- moves from stop to stop		–  Check freedom of movement of recirculated-air flap (and fresh-air flaps)
–  Open all dash panel vents.	t  The fresh air blower -V2- runs at approx. 60 % of maximum speed t  The fresh-air and air flow flap is closed. –  The recirculated-air flap (and fresh-air flap) opens and closes. –  The flow of air from the vents changes (left-hand drive vehicles). –  The air is alternately drawn in in the passenger's footwell or via the dust and pollen filter (right-hand drive vehicles)		–  Use current flow diagram to check wiring between air recirculation flap control motor -V113- and operating and display unit, Climatronic control unit -J255- for open circuit or interchange –  Check air recirculation flap control motor -V113- → Chapter. –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  On left-hand drive vehicles, the air recirculation flap control motor -V113- only moves the recirculated-air flap. The air flow/fresh-air flaps are moved by the air flow flap control motor -V71-. t  On right-hand drive vehicles, the air recirculation flap control motor -V113- moves both the recirculated-air flap and the fresh-air flaps. Air flow control is not provided for these vehicles, which are not fitted with an air flow flap control motor -V71-.

Indicated on display	Specified function		Fault rectification
Segment test	t  All display segments, the function indicator lamps in the buttons and the illumination of the operating and display unit, Climatronic control unit -J255- are switched on and off at 2-second intervals.		–  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

The actuation sequence for the components listed in the following is governed by the optional extras in the vehicle and the version of the operating and display unit, Climatronic control unit -J255-. t  The vehicles manufactured at the start of production are fitted with an operating and display unit, Climatronic control unit -J255- with which, e.g. following the “segment test”, the heated rear window -Z1- is actuated first and then (if fitted as optional extras) the heated windscreen -Z2-, the heated driver seat cushion -Z6- and the heated front passenger seat cushion -Z8-. t  On vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue, the heated driver seat cushion -Z6- and the heated front passenger seat cushion -Z8- are actuated first for example (if fitted as optional extra). This is followed by actuation of the heated rear window -Z1- and (if fitted as optional extra) the heated windscreen -Z2-.

Indicated on display	Specified function		Fault rectification
Heated rear window -Z1-	t  The heated rear window is switched on once for 10 seconds –  The heated rear window -Z1- becomes warm in the area of the heating coils.		–  Check actuation and current input of heated rear window -Z1- → Chapter –  Check heated rear window relay -J9- as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue → Current flow diagrams, Electrical fault finding and Fitting locations –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  On vehicles up to chassis number “399999” in Model Year 2005 (Saloon and Avant) and “012912” in Model Year 2005 (Cabrio) → Parts catalogue, the heated rear window -Z1- is actuated directly by the operating and display unit, Climatronic control unit -J255- (the relay which switches the current is fitted in the operating and display unit, Climatronic control unit -J255-) t  On vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue, the heated rear window -Z1- is no longer actuated directly by the operating and display unit, Climatronic control unit -J255- (the operating and display unit, Climatronic control unit -J255- with part number as of index “AJ” is not fitted with a relay). On these vehicles, the heated rear window -Z1- is actuated by way of the heated rear window relay -J9-. t  The activation function of the operating and display unit, Climatronic control unit -J255- for the heated rear window -Z1- can, for example on vehicles up to chassis number “399999” in Model Year 2005 (Saloon and Avant) and “012912” in Model Year 2005 (Cabrio) → Parts catalogue, be checked during final control diagnosis using the multimeter -V.A.G 1715 -. Connect the current probe to the positive wire from the operating and display unit, Climatronic control unit -J255- to the heated rear window -Z1- and select the “Current measurement via current probe” function on the multimeter. The display changes from approx. 0 A to greater than 7 A. t  If, after the control element heated rear window -Z1- on vehicles with no “heated windscreen” as optional extra, this control element is displayed, check encoding of operating and display unit, Climatronic control unit -J255- → Chapter.

Indicated on display	Specified function		Fault rectification
END	Info display –  End of control element test, e.g. for vehicles with neither heated seats nor heated windscreen as optional extras

Indicated on display	Specified function		Fault rectification
Heated windscreen -Z2-	t  The heated windscreen control unit -J505- is actuated for approx. 10 seconds. –  The heated windscreen control unit -J505- switches on the heated windscreen -Z2- if the electrical system voltage is greater than 12.70 V.		–  Read measured value block (display group “015”) → Chapter –  Use current flow diagram to check power supply and earth connection to heated windscreen control unit -J505-. –  Use current flow diagram to check wiring between operating and display unit, Climatronic control unit -J255- and heated windscreen control unit -J505-. –  Check actuation and current input of heated windscreen -Z2- → Chapter –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  If, on vehicles with no “heated windscreen” as optional extra, this control element is actuated, check encoding of operating and display unit, Climatronic control unit -J255- → Chapter. t  During final control diagnosis, the heated windscreen -Z2- is only actuated by the operating and display unit, Climatronic control unit -J255- up to a passenger compartment temperature of approx. 40° C. If the temperature is higher, “Function unknown or cannot be implemented at present” appears on the fault reader display. t  The activation function of the heated windscreen control unit -J505- can be checked for example using the multimeter -V.A.G 1715-. Connect the current probe to the positive wire from the heated windscreen control unit -J505- to the heated windscreen -Z2- and, on multimeter -V.A.G 1715-, select the “Current measurement via current probe” function. The display changes from approx. 0 A to greater than 7 A. t  Operation of the heated windscreen -Z2- is displayed in the measured value block of the operating and display unit, Climatronic control unit -J255- (display group “015”) → Chapter and → Chapter.

Indicated on display	Specified function		Fault rectification
Heated driver seat cushion -Z6-	t  The driver seat cushion heater element is actuated for approx. 10 seconds.		–  Use current flow diagram to check earth connection to heater element in heated driver seat cushion -Z6-. –  Use current flow diagram to check wiring between operating and display unit, Climatronic control unit -J255- and heated driver seat cushion -Z6-. –  Check actuation and current input of heated driver seat cushion -Z6- → Chapter –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  The heated seat cushions are only actuated in the case of an operating and display unit, Climatronic control unit -J255- equipped with a heated seat cushion potentiometer (heed part no. and index) → Parts List. t  The activation function for the heated seat cushions can be checked for example using the multimeter -V.A.G 1715-. Connect the current probe to the positive wire to the seat cushion heater element and, on multimeter -V.A.G 1715-, select the “Current measurement via current probe” function. The display changes from approx. 0 A to greater than 2 A.

Indicated on display	Specified function		Fault rectification
Heated front passenger seat cushion -Z8-	t  The front passenger seat cushion heater element is actuated for approx. 10 seconds.		–  Use current flow diagram to check earth connection to heater element in heated front passenger seat cushion -Z8-. –  Use current flow diagram to check wiring between operating and display unit, Climatronic control unit -J255- and heated front passenger seat cushion -Z8-. –  Check actuation and current input of heated front passenger seat cushion -Z8- → Chapter –  Replace operating and display unit, Climatronic control unit -J255- → Chapter.

Note t  The heated seat cushions are only actuated in the case of an operating and display unit, Climatronic control unit -J255- equipped with a heated seat cushion potentiometer (heed part no. and index) → Parts List. t  The activation function for the heated seat cushions can be checked for example using the multimeter -V.A.G 1715-. Connect the current probe to the positive wire to the seat cushion heater element and, on multimeter -V.A.G 1715-, select the “Current measurement via current probe” function. The display changes from approx. 0 A to greater than 2 A.

t	The “Seat ventilation” optional extra is not available at present (introduction not yet finalised).

t	Operating and display units, Climatronic control unit -J255- designed for actuation of the seat ventilation function can be identified from the part no. → Parts List and the seat heating knurled wheels (on these, the “0” position is in the centre of the adjustment range)

Indicated on display	Specified function		Fault rectification
Driver side seat ventilation	t  The driver seat ventilation is actuated for approx. 10 seconds by way of the convenience data bus system. –  Introduction as optional extra not yet finalised –  The fans in the driver seat operate		–  Check seat ventilation control unit and actuation of fan in driver seat → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → General body repairs, interior; Rep. Gr.72
Passenger side seat ventilation	t  The passenger seat ventilation is actuated for approx. 10 seconds by way of the convenience data bus system. –  Introduction as optional extra not yet finalised –  The fans in the passenger seat operate		–  Check seat ventilation control unit and actuation of fan in passenger seat → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 and → General body repairs, interior; Rep. Gr.72