Audi Workshop Service and Repair Manuals

Test step “4” Control motors of air conditioner and corresponding potentiometers   Note t  The resistance of the potentiometers in the control motors (specification: 3.6 ... 5.7 kΩ between contacts “1” and “3”) can only be measured directly at the control motor (parallel connection). t  The resistance of the potentiometers in the control motors (between contacts “1” and “2 ” as well as “3” and “2”) is governed by the position of the control motor and is only to be measured with the control motor fitted. The upper specification is not attained in test steps “4.1” and “4.2”. (To achieve the upper specification, all connectors would have to be unplugged from the other control motors during measurement on account of the parallel connection). t  If the operating and display unit, Climatronic control unit -J255- detects the fault “Potentiometer short to earth” or “Open circuit/short to positive”, check all potentiometers in the control motors as well as the corresponding wiring. t  If several control motors are simultaneously displayed as being defective in the fault memory and if no fault is found in test step “4”, check the potentiometers in all control motors and the wiring between the individual control motors for short circuit (e.g. between defroster flap control motor -V107- and central flap control motor -V70-; with connectors unplugged from all control motors as well as from operating and display unit, Climatronic control unit -J255-, the measuring instrument reading between sockets “1”, “2” and “3” in the corresponding connector must be “∞ Ω”).

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (20 kΩ) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.1	21 + 22	Left temperature flap control motor potentiometer -G220- (in left temperature flap control motor -V158-)		l  Ignition off		t  Greater than 0.1 kΩ and less than 5.7 kΩ		–  Use current flow diagram to locate and eliminate short circuit, open circuit in wiring or contact resistance
	21 + 23	Right temperature flap control motor potentiometer -G221- (in right temperature flap control motor -V159-)				–  Depending on position of control motor		–  Replace control motor
	21 + 24	Defroster flap control motor potentiometer -G135- (in defroster flap control motor -V107-)
	21 + 25	Central flap control motor potentiometer -G112- (in central flap control motor -V70-)
	21 + 26	Air recirculation flap control motor potentiometer -G143- (in air recirculation flap control motor -V113-)
	21 + 27	Air flow flap control motor potentiometer -G113- (in air flow flap control motor -V71-)

Note t  The air flow flap control motor -V71- is only fitted on left-hand drive vehicles and is used to actuate the air flow/fresh-air flap. t  Right-hand drive vehicles are not fitted with an air flow flap control motor -V71-. On these vehicles, the resistance to socket “27” must be ∞ Ω∼ (ohms). The fresh-air flap is moved on such vehicles by the air recirculation flap control motor -V113-. t  On right-hand drive vehicles, the assignment of the contacts in the connectors is interchanged in line with the different installation position of the control motors (contact “1” with “3” and “5” with “6”) → Current flow diagrams, Electrical fault finding and Fitting locations

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (20 kΩ) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.2	34 + 22	Left temperature flap control motor potentiometer -G220- (in left temperature flap control motor -V158-)		l  Ignition off		t  Greater than 0.1 kΩ and less than 5.7 kΩ		–  Use current flow diagram to locate and eliminate short circuit, open circuit in wiring or contact resistance
	34 + 23	Right temperature flap control motor potentiometer -G221- (in right temperature flap control motor -V159-)				–  Depending on position of control motor		–  Replace control motor
	34 + 24	Defroster flap control motor potentiometer -G135- (in defroster flap control motor -V107-)
	34 + 25	Central flap control motor potentiometer -G112- (in central flap control motor -V70-)
	34 + 26	Air recirculation flap control motor potentiometer -G143- (in air recirculation flap control motor -V113-)
	34 + 27	Air flow flap control motor potentiometer -G113- (in air flow flap control motor -V71-)

Note t  The air flow flap control motor -V71- is only fitted on left-hand drive vehicles and is used to actuate the air flow/fresh-air flap. t  Right-hand drive vehicles are not fitted with an air flow flap control motor -V71-. On these vehicles, the resistance to socket 27 must be ∞ Ω∼ (ohms). The fresh-air flap is moved on such vehicles by the air recirculation flap control motor -V113-. t  On right-hand drive vehicles, the assignment of the contacts in the connectors is interchanged in line with the different installation position of the control motors (contact “1” with “3” and “5” with “6”) → Current flow diagrams, Electrical fault finding and Fitting locations

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (20 kΩ) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.3	Earth → Note + 22	Left temperature flap control motor potentiometer -G220- (in left temperature flap control motor -V158-)		l  Ignition off		t  ∞ Ω		–  Use current flow diagram to locate and eliminate short to earth
	Earth → Note + 23	Right temperature flap control motor potentiometer -G221- (in right temperature flap control motor -V159-)						–  Replace control motor
	Earth → Note + 24	Defroster flap control motor potentiometer -G135- (in defroster flap control motor -V107-)
	Earth → Note + 25	Central flap control motor potentiometer -G112- (in central flap control motor -V70-)
	Earth → Note + 26	Air recirculation flap control motor potentiometer -G143- (in air recirculation flap control motor -V113-)
	Earth → Note + 27	Air flow flap control motor potentiometer -G113- (in air flow flap control motor -V71-)

1)  Earth is applied to connector “D”, contact “13”.   Note t  The air flow flap control motor -V71- is only fitted on left-hand drive vehicles and is used to actuate the air flow/fresh-air flap. t  Right-hand drive vehicles are not fitted with an air flow flap control motor -V71-. The fresh-air flap is moved on such vehicles by the air recirculation flap control motor -V113-. t  On right-hand drive vehicles, the assignment of the contacts in the connectors is interchanged in line with the different installation position of the control motors (contact “1” with “3” and “5” with “6”) → Current flow diagrams, Electrical fault finding and Fitting locations

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (200 Ω) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.4	41 + 42	Left temperature flap control motor -V158-		l  Ignition off		t  20 ... 100 Ω		–  Use current flow diagram to locate and eliminate short circuit, open circuit in wiring or contact resistance
4.5	51 + 52	Right temperature flap control motor -V159-						–  Replace control motor
4.6	47 + 48	Air recirculation flap control motor -V113-
4.7	43 + 44	Defroster flap control motor -V107-
4.8	45 + 46	Central flap control motor -V70-
4.9	49 + 50	Air flow flap control motor -V71-

Note t  The air flow flap control motor -V71- is only fitted on left-hand drive vehicles and is used to actuate the air flow/fresh-air flap. t  Right-hand drive vehicles are not fitted with an air flow flap control motor -V71-. The fresh-air flap is moved on such vehicles by the air recirculation flap control motor -V113-. t  On right-hand drive vehicles, the assignment of the contacts in the connectors is interchanged in line with the different installation position of the control motors (contact “1” with “3” and “5” with “6”) → Current flow diagrams, Electrical fault finding and Fitting locations t  Right-hand drive vehicles are not fitted with an air flow flap control motor -V71-. On these vehicles, the resistance between sockets “49” and “50” must be ∞ Ω∼ (ohms).

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (200 Ω) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.10		Short to earth in wiring to control motors
	Earth → Note + 41	Left temperature flap control motor -V158-		l  Ignition off		t  ∞ Ω		–  Use current flow diagram to eliminate short to earth
	Earth → Note + 43	Defroster flap control motor -V107-
	Earth → Note + 45	Central flap control motor -V70-
	Earth → Note + 47	Air recirculation flap control motor -V113-
	Earth → Note + 49	Air flow flap control motor -V71-
	Earth → Note + 51	Right temperature flap control motor -V159-

2)  Earth is applied to connector “D”, contact “13”.

Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, voltage measurement (20 VDC) l  Adapter cable -V.A.G 1598/11- connected
Test step	Test box -V.A.G 1598A- socket	Checking of		l  Test conditions –  Additional operations		Specification		Measures to be taken if reading does not match specification
4.11		Short to positive in wiring to control motors
	Earth → Note + 41	Left temperature flap control motor -V158-		l  Ignition on		t  Less than 1 V		–  Use current flow diagram to eliminate short to positive
	Earth → Note + 43	Defroster flap control motor -V107-
	Earth → Note + 45	Central flap control motor -V70-
	Earth → Note + 47	Air recirculation flap control motor -V113-
	Earth → Note + 49	Air flow flap control motor -V71-
	Earth → Note + 51	Right temperature flap control motor -V159-

3)  Earth is applied to connector “D”, contact “13”.