Audi Workshop Service and Repair Manuals

Fault table   Note t  All the possible faults detected by the operating and display units for air conditioner/Climatronic -E87- and displayed on the vehicle diagnostic, testing and information system -VAS 5051- when the content of the fault memory is interrogated are listed below on the basis of the fault codes. t  The content of the fault memory is retained until it is erased → Chapter. t  Sporadic faults are marked “/ SP” on the display. t  With all sporadically occurring faults, pay particular attention to the possibility of loose contacts in the connectors. t  If defective components are detected when the fault memory is read out, also use the current flow diagram to check the wiring to the components for short circuits and open circuits. → "Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations" t  Check the appropriate plug contacts before replacing a component. t  Before replacing the operating and display units for air conditioner/Climatronic -E87-, also check the voltage supply and the earth connections: → Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations t  If the operating and display units for air conditioner/Climatronic -E87- remains in operation after the ignition has been switched off; check the wiring for the operating and display units for air conditioner/Climatronic -E87-, connector “D”, contact “10”, for a “short-circuit to positive”. t  Always perform the basic setting (function “04”) after replacing an air conditioner/heater component. Then read out the fault memory, rectify any faults displayed and erase the fault memory (functions “02” and “05”). t  The display is switched from “°C” (Celsius) to “°F” (Fahrenheit) and vice versa by actuating the “Temperature +” button when the “Recirculated air” button is pressed. t  Check the cooling output of the air conditioner → Chapter t  If during one driving cycle the compressor output was limited 30 times due to high pressure in the refrigerant circuit, e.g. due to an intermittent electrical fault, then the air conditioner compressor regulating valve -N280- is no longer actuated, and the compressor is switched off as a result. The compressor can be re-actuated by pressing the “Compressor on” button or by switching the ignition off and on again. t  If a potentiometer fault is detected in one of the air distribution positioning motors, air distribution can be influenced by pressing the buttons on the operating and display units for air conditioner/Climatronic -E87-. t  If a fault is detected in the temperature control and no fault is displayed: t  - Check that the temperature sensors (senders) are correctly installed. t  - Check if the wiring to the sunlight penetration photosensor -G107- has become interchanged. t  - Check the function of the temperature sensor blower -V42- (installed in the operating and display units for air conditioner/Climatronic -E87-).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer	Possible causes of fault	Fault remedy
No fault detected	If no faults are detected despite complaints about the electronic climate/heater control, perform “Final control diagnosis 03” and “Read measured value block 08” functions and check the encoding of the operating and display units for air conditioner/Climatronic -E87- and of the control unit in the dash panel insert -J285- → Note → Chapter

1)  In this vehicle the encoding is performed in the control unit in the dash panel insert -J285- and is transferred to the connected vehicle systems via the convenience data bus; the encoding which is currently valid is displayed in the measured value block → Chapter. There is no facility at present for direct code input into the operating and display units for air conditioner/Climatronic -E87- (however, this feature may be introduced for optional extras at a later date). → Electrical System; Repair group 01

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00532
Power supply
	Signal too small /SP		t  Voltage in the vehicle electrical system drops to values below 9.5 V → Note	–  Check the alternator and voltage regulator: → Current Flow Diagrams, Electrical Fault-Finding, Fitting Locations
	Signal too great/SP		t  The voltage in the vehicle's electrical system was greater than 15 V → Note	–  Check the alternator and voltage regulator: → Current Flow Diagrams, Electrical Fault-Finding, Fitting Locations

2)  If the vehicle system voltage (at connector “D”, contact “12”) drops below 9.5 V, the heated rear window -Z1- for example is deactivated. 3)  This fault may also be displayed if the battery -A- has been charged using an unsuitable charger.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00600
Potentiometer - positioning motor for temperature flap -G92- in the positioning motor for temperature flap -V68- (for the temperature flap) → Note6
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the potentiometer - positioning motor for temperature flap -G92- and the operating and display unit for air conditioner/Climatronic -E87- t  Potentiometer - positioning motor for temperature flap -G92- in the positioning motor for temperature flap -V68- defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Replace the positioning motor for temperature flap -V68-
	Adaption limit exceeded → Note4		t  Temperature flap is stiff t  Potentiometer - positioning motor for temperature flap -G92- in the positioning motor for temperature flap -V68- defective	–  Check that the temperature flap is moving freely → Note5 –  Replace the positioning motor for temperature flap -V68-
	Fault		t  Potentiometer - positioning motor for temperature flap -G92- in the positioning motor for temperature flap -V68- defective	–  Replace the positioning motor for temperature flap -V68-

4)  4- This fault is only detected during basic setting. If this fault is present, “30” or “230” is stored as the adaption value (learned value for this potentiometer) and displayed in the relevant measured value block. 5)  5- Both end stops must be reached. 6)  6- If there is a fault in the potentiometer - positioning motor for temperature flap -G92-, the positioning motor for temperature flap -V68- can be adjusted manually by pressing the “+” or “-” buttons for the temperature preselection (display range 0 ... 50 °C)

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00601
Potentiometer - positioning motor for central flap -G112- in the positioning motor for central flap -V70-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the potentiometer - positioning motor for central flap -G112- and the operating and display units for air conditioner/Climatronic -E87- t  Potentiometer - positioning motor for central flap -G112- in the positioning motor for central flap -V70- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Replace the positioning motor for central flap -V70-
	Adaption limit exceeded → Note4		t  Central flap is stiff t  Potentiometer - positioning motor for central flap -G112- in the positioning motor for central flap -V70- is defective	–  Check that the central flap is moving freely → Note5 –  Replace the positioning motor for central flap -V70-
	Fault		t  Potentiometer - positioning motor for central flap -G112- in the positioning motor for central flap -V70- is defective	–  Replace the positioning motor for central flap -V70-

7)  4- This fault is only detected during basic setting. If this fault is present, “30” or “230” is stored as the adaption value (learned value for this potentiometer) and displayed in the relevant measured value block. 8)  5- Both end stops must be reached.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00710
Defroster flap positioning motor -V107-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the positioning motor for defrost flap -V107- and the operating and display units for air conditioner/Climatronic -E87- t  The defrost flap positioning motor -V107- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Check the defrost flap positioning motor -V107- → Chapter (final control diagnosis)
	Blocked or deenergised /SP		t  Defrost flap is stiff t  Defrost flap positioning motor -V107- is defective	–  Check that the defrost flap is moving freely –  Checking the defrost flap positioning motor -V107- → Chapter (final control diagnosis)

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00716
Recirculated air flap positioning motor -V113-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the positioning motor for recirculated-air flap -V113- and the operating and display units for air conditioner/Climatronic -E87- t  The recirculated-air flap positioning motor -V113- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Check the recirculated-air flap positioning motor -V113- → Chapter (final control diagnosis)
	Blocked or deenergised /SP		t  The fresh or recirculated-air flap is sticking t  The recirculated-air flap positioning motor -V113- is defective	–  Check that the fresh and recirculated-air flap is moving freely. –  Check the recirculated-air flap positioning motor -V113- → Chapter (final control diagnosis)

Note The recirculated-air flap positioning motor -V113- moves both the recirculated-air flap and the fresh-air flap (air flow flap).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00727
Potentiometer in the positioning motor for defrost flap -G135- in the positioning motor for defrost flap -V107-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the potentiometer in the positioning motor for defrost flap -G135- and the operating and display units for air conditioner/Climatronic -E87- t  Potentiometer in the positioning motor for defrost flap -G135- in the positioning motor for defrost flap -V107- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Replace the defrost flap positioning motor -V107-
	Adaption limit exceeded → Note4)		t  The defrost flap is stiff	–  Check that the defrost flap is moving freely → Note5
	Fault		t  Potentiometer in the positioning motor for defrost flap -G135- in the positioning motor for defrost flap -V107- is defective	–  Replace the defrost flap positioning motor -V107-

9)  4- This fault is only detected during basic setting. If this fault is present, “30” or “230” is stored as the adaption value (learned value for this potentiometer) and displayed in the relevant measured value block. 10)  5- Both end stops must be reached.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00735
Potentiometer in the positioning motor for recirculated-air flap -G143- in the positioning motor for recirculated-air flap -V113-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the potentiometer in the positioning motor for recirculated-air flap -G143- and the operating and display units for air conditioner/Climatronic -E87- t  Potentiometer in the positioning motor for recirculated-air flap -G143- in the positioning motor for recirculated-air flap -V113- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Replace the positioning motor for recirculated-air flap -V113-
	Adaption limit exceeded → Note4)		t  The fresh/recirculated-air flap is sticking t  Potentiometer in the positioning motor for recirculated-air flap -G143- in the positioning motor for recirculated-air flap -V113- is defective	–  Check that the fresh and recirculated-air flap is moving freely → Note 5 –  Replace the positioning motor for recirculated-air flap -V113-
	Fault		t  Potentiometer in the positioning motor for recirculated-air flap -G143- in the positioning motor for recirculated-air flap -V113- is defective	–  Replace the positioning motor for recirculated-air flap -V113-

11)  4- This fault is only detected during basic setting. If this fault is present, “30” or “230” is stored as the adaption value (learned value for this potentiometer) and displayed in the relevant measured value block. 12)  5- Both end stops must be reached.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00785
Dash panel temperature sensor -G56- → Note7
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Dash panel temperature sensor -G56- is defective	–  Replace the operating and display unit for air conditioner/Climatronic -E87-
00787
Fresh-air intake duct temperature sensor -G89-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit or open circuit between the fresh-air intake duct temperature sensor -G89- and the operating and display unit for air conditioner/Climatronic -E87- t  Fresh-air intake duct temperature sensor -G89- is defective	–  Use the current flow diagram to locate and rectify the short circuit/open circuit in the wiring –  Check the fresh-air intake duct temperature sensor -G89- → Chapter (electrical check).

13)  7- The dash panel temperature sensor -G56- is installed into the Climatronic operating and display unit -E87-. The dash panel temperature sensor -G56- cannot be tested and replaced separately; in the event of a defect, replace the entire operating and display unit for air conditioner/Climatronic -E87-.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00796
Temperature sensor blower -V42- → Note8
	Blocked or deenergised /SP		t  Temperature sensor blower -V42- is defective	–  Replace the temperature sensor blower -V42- → Chapter
00797
Sunlight penetration photosensor -G107-
	Open circuit / short circuit to earth / SP short circuit to positive / SP		t  Short circuit or open circuit between the sunlight penetration photosensor -G107- and -E87- t  the sunlight penetration photosensor -G107- is defective	–  Use the current flow diagram to locate and rectify the short circuit/open circuit in the wiring –  Check the sunlight penetration photosensor -G107- → Chapter (Read the measured value block)

14)  8- The temperature sensor blower -V42- is installed in the operating and display unit for air conditioner/Climatronic -E87-.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00818
Evaporator outflow temperature sender -G263-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit or open circuit between the evaporator outflow temperature sender -G263- and the operating and display unit for air conditioner/Climatronic -E87- t  Evaporator outflow temperature sender -G263- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check the evaporator outflow temperature sender -G263- → Chapter (electrical check).

Note If a defect is detected in the evaporator outlet temperature sender -G263-, the operating and display unit for air conditioner/Climatronic -E87- switches to emergency running and the air conditioner compressor regulating valve -N280- is only actuated with a max. control current of approx. 0.3 to 0.5 A at that time (as a result, the refrigeration capacity of the air conditioner is reduced and, at higher temperatures, the cooling performance may no longer prove to be adequate) → Chapter (Read the measured value block).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00819
High-pressure sender -G65-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit or open circuit between the high-pressure sender -G65- and the operating and display unit for air conditioner/Climatronic -E87- t  High-pressure sender -G65- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check the high-pressure sender -G65- → Chapter (electrical check).
	Signal too small /SP		t  Open circuit in the power supply or in the earth connection to high-pressure sender -G65- t  High-pressure sender -G65- is defective t  Too little refrigerant in the refrigerant circuit	–  Use the current flow diagram to locate and rectify the open circuit: –  Check the high-pressure sender -G65- → Chapter (electrical check). –  Check the pressure in the refrigerant circuit (this can only be done in a specialist air conditioner workshop) → Air conditioner - with refrigerant R134a
	Signal too great /SP		t  High-pressure sender -G65- is defective t  Fault in radiator fan actuation t  Too much refrigerant in the refrigerant circuit	–  Check the high-pressure sender -G65- → Chapter (electrical check). –  Check actuation of the radiator fan → Chapter –  Check the pressure in the refrigerant circuit (this can only be done in a specialist air conditioner workshop). → Air conditioner - with refrigerant R134a

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
00975
Heated rear window -Z1-
	Output not switched / short circuit to positive /SP		t  Short circuit or open circuit between the heated rear window -Z1- and the operating and display unit for air conditioner/Climatronic -E87- t  Open circuit in the earth connection for the heated rear window -Z1- t  Heated rear window -Z1- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check actuation and power consumption of the heated rear window -Z1- → Chapter (electrical check).
	Output does not switch/short circuit to earth /SP open circuit /SP		t  Short circuit between the heated rear window -Z1- and the operating and display unit for air conditioner/Climatronic -E87- t  Heated rear window -Z1- is defective	–  Locate and rectify the short circuit using the current flow diagram –  Check actuation and power consumption of the heated rear window -Z1- → Chapter (electrical check).
	Open circuit /SP		t  Open circuit in the heated rear window -Z1-, in the earth connection to the heated rear window -Z1- or in the connection between the heated rear window -Z1- and the operating and display unit for air conditioner/Climatronic -E87- t  Open circuit in the power supply to the connector “F” on the operating and display unit for air conditioner/Climatronic -E87-	–  Use the current flow diagram to locate and rectify the open circuit: –  Check actuation and power consumption of the heated rear window -Z1- → Chapter (electrical check).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer	Possible causes of fault	Fault remedy
01044 The control unit is incorrectly encoded
	t  The dash panel insert control unit encoding has not been performed as specified. t  The encoding of the convenience system central control unit -J393- has not been performed as specified. t  Fault in the factory convenience data bus t  The encoding of the operating and display unit for air conditioner/Climatronic -E87- has not been performed as specified.	–  Check the encoding transferred to the operating and display unit for air conditioner/Climatronic -E87- → Chapter (Read the measured value block) –  Check the encoding of the control unit in dash panel insert -J285- and encode it in the specified manner if necessary. → Electrical System; Repair group 01 –  Check the encoding of the convenience system central control unit -J393- and encode it in the specified manner if necessary. → Electrical System; Repair group 01 –  Interrogate the fault memory for all the control units connected to the data bus system and identify and rectify the faults displayed on the data bus system → Electrical System; Repair group 01 –  Check the encoding of the operating and display unit for air conditioner/Climatronic -E87- → Chapter (the encoding of the operating and display unit for air conditioner/Climatronic -E87- is only required if certain optional extras are deployed).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer	Possible causes of fault	Fault remedy
01087 Basic setting is not performed
	t  During the “basic setting” a fault occurred or the ignition was switched off, and the operating and display unit for air conditioner/Climatronic -E87- was unable to complete the function. t  After replacing the operating and display unit for air conditioner/Climatronic -E87- no basic setting was performed. t  The basic setting was performed on a operating and display unit for air conditioner/Climatronic -E87- which was not (correctly) encoded	–  Perform theoperating and display unit for air conditioner/Climatronic -E87- basic setting → Chapter. –  Check the encoding transferred to the operating and display unit for air conditioner/Climatronic -E87- → Chapter (Read the measured value block)

Note (Depending on the version of the operating and display unit for air conditioner/Climatronic -E87-), it switches automatically to “Econ” mode if no basic setting is performed following the installation of a new operating and display unit for air conditioner/Climatronic -E87-.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
01206 Ignition-off time-span signal
	Implausible signal /SP		t  The dash panel insert performed a restart (reset) after the connection of the battery and therefore could not send a time signal	–  Start the engine and let it run for 30 sec. –  Switch off the engine –  Switch on the ignition. –  Interrogate and erase the fault memory for the operating and display unit for air conditioner/Climatronic -E87- –  Check the time signal from the dash panel insert → Chapter (Read the measured value block, display group“ 014”)
			t  Fault in the control unit in the dash panel insert -J285-	–  Interrogate the fault memory of the control unit in the dash panel insert -J285-. → Electrical System; Repair group 01

Note If the operating and display unit for air conditioner/Climatronic -E87- does not detect an “ignition-off time-span signal” when the ignition is switched on (sent by the control unit in the dash panel insert -J285- via the convenience data bus), the operating and display unit for air conditioner/Climatronic -E87- assumes that the vehicle has been standing for more than 4 hours, and that the engine temperature is the same as the ambient temperature. In heating mode, this may result in the start-up of the fresh-air blower being delayed, even though the engine is warm. The ambient temperature indicator -G106- in the control unit in the dash panel insert -J285- may possibly also show rogue ambient temperature readings.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible causes of fault	Fault remedy
01232
Air conditioner compressor regulating valve -N280- → Note9
	Short circuit to earth / SP short circuit to positive / SP open circuit / SP		t  Short circuit or open circuit between the air conditioner compressor regulating valve -N280- and the operating and display unit for air conditioner/Climatronic -E87- t  Open circuit in the voltage supply to the air conditioner compressor regulating valve -N280- t  Air conditioner compressor regulating valve -N280- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check the air conditioner compressor regulating valve -N280- → Chapter (electrical check) and → Chapter (Read the measured value block)

15)  9- The regulating valve is installed in the compressor (the compressor can only be replaced in a specialist air conditioner workshop). → Air conditioner with refrigerant R134a

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01271
Temperature flap positioning motor -V68-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the positioning motor for temperature flap -V68- and the operating and display unit for air conditioner/Climatronic -E87- t  The positioning motor for temperature flap -V68- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Check the positioning motor for temperature flap -V68- → Chapter (final control diagnosis)
	Blocked or deenergised /SP		t  Temperature flap is stiff t  The positioning motor for temperature flap -V68- is defective	–  Check that the temperature flap is moving freely –  Check the positioning motor for temperature flap -V68- → Chapter (final control diagnosis)

Display on the vehicle diagnosis, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01272
Central flap positioning motor -V70-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit, open circuit or wiring fault between the positioning motor for central flap -V70- and the operating and display unit for air conditioner/Climatronic -E87- t  The central flap positioning motor -V70- is defective	–  Use the current flow diagram to locate and rectify the short circuit, open circuit or wiring fault –  Check the positioning motor for central flap -V70- → Chapter (final control diagnosis)
	Blocked or deenergised /SP		t  Central flap is stiff t  The central flap positioning motor -V70- is defective	–  Check that the central flap is moving freely –  Check the positioning motor for central flap -V70- → Chapter (final control diagnosis)

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01273
Fresh-air blower -V2-
	System deviation / SP blocked or deenergised / SP short circuit to positive / SP defective		t  Short circuit or open circuit between the fresh-air blower -V2-, the control unit for the fresh-air blower -J126- and/or the operating and display unit for air conditioner/Climatronic -E87- t  Open circuit in power supply or earth connection to the control unit for the fresh-air blower -J126-	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Use the current flow diagram to locate and rectify the open circuit:
			t  The control unit for the fresh-air blower -J126- is defective	–  Check the control unit for the fresh-air blower -J126- → Chapter (electrical check).
			t  The fresh-air blower -V2- is defective	–  Replace the fresh-air blower -V2-
	Power supply too low /SP		t  The voltage in the vehicle electrical system drops to values below 9.5 V t  Open circuit or contact resistance in the power supply to the fresh-air blower -V2-	–  Check the alternator and voltage regulator: → "Current Flow Diagrams, Electrical Fault-Finding, Fitting Locations" –  Check the wiring according to the current flow diagram.
	Power supply too high /SP		t  The voltage in the vehicle's electrical system was greater than 15 V → Note3	–  Check the alternator and voltage regulator: → "Current Flow Diagrams, Electrical Fault-Finding, Fitting Locations"

16)  3- This error may also appear if the battery -A- has been charged using an unsuitable charger.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01296
Centre vent temperature sender -G191-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit or open circuit between the centre vent temperature sender -G191- and the operating and display unit for air conditioner/Climatronic -E87- t  The centre vent temperature sender -G191- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check the centre vent temperature sender -G191- → Chapter (electrical check).
01297
Footwell vent temperature sender -G192-
	Short circuit to earth / SP open circuit/short circuit to positive / SP		t  Short circuit or open circuit between the footwell vent temperature sender -G192- and the operating and display unit for air conditioner/Climatronic -E87- t  The footwell vent temperature sender -G192- is defective	–  Use the current flow diagram to locate and rectify the short circuit or open circuit –  Check the footwell vent temperature sender -G192- → Chapter (electrical check).

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01312
Drive data bus
	Read out the fault memory		t  The dash panel insert cannot output the required data due to a fault and emits a fault message. t  The dash panel insert cannot output the required data due to a fault in an upstream component and emits a fault message. t  A control unit which is connected to the drive data bus does not supply the required data or there is a drive data bus fault.	–  Interrogate the fault memory of the dash panel insert. –  Locate and rectify the causes of all the faults stored in the fault memory of the dash panel insert. –  Interrogate the fault memory for all the control units connected to the drive data bus and identify and rectify the faults displayed on the data bus system → Electrical System; Repair group 01

Note If, for example, the engine control unit does not supply information on the current engine speed (via the drive data bus), the control unit and display unit in the dash panel insert -J285- cannot incorporate this information into the data telegram on the convenience data bus, and this fault is entered in the fault memory of the operating and display unit for air conditioner/Climatronic -E87-.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01317
Control unit and display unit in the dash panel insert -J285-
	Read out the fault memory		t  The control unit in the dash panel insert -J285- cannot output the required data because of a fault and emits a fault message. t  The control unit in the dash panel insert -J285- cannot output the required data due to a fault in an upstream component and emits a fault message.	–  Interrogate the fault memory of the control unit in the dash panel insert -J285-. → Electrical System; Repair group 01 –  Locate and rectify the causes of all the faults stored in the fault memory of the control unit in the dash panel insert -J285-.
	No communication /SP		t  An open circuit in both signal wires (convenience data bus) between the dash panel insert and the operating and display unit for air conditioner/Climatronic -E87-	–  Locate and rectify an open circuit or intermittent electrical fault in both signal wires (convenience data bus) between the control unit in the dash panel insert -J285- and the operating and display unit for air conditioner/Climatronic -E87- in accordance with the current flow diagram. –  Check the (convenience) data bus system → Chapter.
	No communication / SP		t  There is a fault affecting data output in the control unit in the dash panel insert -J285- or in a component connected to it.	–  Interrogate the fault memory of the control unit in the dash panel insert -J285-. → Electrical System; Repair group 01

Note The reception of the information is displayed in the measured value block display group “016” → Chapter.

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01330
Central control unit for the convenience system -J393-
	Read out the fault memory		t  The central control unit for the convenience system -J393- cannot output the required data because of a fault and emits a fault message. t  The central control unit for the convenience system -J393- cannot output the required data due to a fault in an upstream component and emits a fault message.	–  Interrogate the fault memory for the central control unit for the convenience system -J393-. → Electrical System; Repair group 01 –  Locate and rectify the causes of all the faults stored in the fault memory of the central control unit for the convenience system -J393-.
	No communication (time out) / SP		t  An open circuit in the (convenience) data bus between the central control unit for the convenience system -J393- and the operating and display unit for air conditioner/Climatronic -E87-	–  Locate and rectify an open circuit or intermittent electrical fault on both signal wires (convenience data bus) between the central control unit for the convenience system -J393- and the operating and display unit for air conditioner/Climatronic -E87- in accordance with the current flow diagram. –  Check the (convenience) data bus system → Chapter.
			t  There is a fault affecting data output in the central control unit for the convenience system -J393- or in a component connected to it.	–  Interrogate the fault memory for the central control unit for the convenience system -J393-. → Electrical System; Repair group 01
			t  The central control unit for the convenience system -J393- does not transmit a data message. t  The operating and display unit for air conditioner/Climatronic -E87- is unable to read the data message sent by the central control unit for the convenience system -J393-.	–  Check the (convenience) data bus system → Chapter.
			t  The voltage supply to the engine control unit was or has been interrupted while the ignition was switched on.	–  Interrogate and erase the fault memories of all control units connected to the data bus system. → Electrical System; Repair group 01

Note t  The reception of the information is displayed in the measured value block display group “016” → Chapter. t  The central control unit for the convenience system -J393- transmits information, for example, on whether the vehicle is LHD or RHD to the bus system (convenience data bus) → Electrical System; Repair group 01

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
01336
Group convenience data bus
	Fault (bus off)		t  Open circuit, short circuit to earth or positive in one of the data bus system's signal wires. t  Short circuit between the data bus system's signal wires.	–  Use the current flow diagram to locate and rectify a short circuit (to earth, positive or between signal wires) or open circuit in the data bus system.
			t  The data bus system's signal wires are interchanged.	–  Use the current flow diagram to check the data bus system's signal wires (convenience data bus).
			t  A control unit connected to the data bus system has disrupted the transmitted data message.	–  Check the (convenience) data bus system → Chapter.
			t  There is a control unit connected to the data bus system which is not designed for the data bus.	–  Check the part numbers of all the control units connected to the data bus system. → Parts List
	In single-wire operating mode		t  Open circuit, short circuit to earth or positive in one of the data bus system's signal wires.	–  Use the current flow diagram to locate and rectify a short circuit (to earth, positive or between signal wires) or open circuit in the (convenience) data bus system.
			t  A control unit connected to the data bus system has disrupted the transmitted data message on one of the two signal wires.	–  Check the (convenience) data bus system → Chapter.
	missing messages (time-out for several control units)		t  Open circuit e.g. on a distribution node on the data bus system's signal wires. t  Open circuit in the power supply to one or more control unit(s) which are connected to the data bus system.	–  Locate and rectify the open circuit in the data bus system using the current flow diagram t  Use the current flow diagram to locate and rectify an open circuit in the voltage supply to one or more control units which are connected to the data bus system.

Note t  The reception of the information is displayed in the measured value block display group “016” → Chapter. t  If a fault is saved in the convenience data bus in vehicles built since 2002, check the part number of the operating and display unit for air conditioner/Climatronic -E87-. There may only be a operating and display unit for air conditioner/Climatronic -E87- installed with a part number from index “D”. The operating and display units for air conditioner/Climatronic -E87- are coordinated with the factory-fitted radios in vehicles built since 2002. (The radio has been integrated into the data bus system in vehicles built since 2002). → Electrical System; Repair group 01 → Parts List

Display on the vehicle diagnostic, testing and information system -VAS 5051- and output on the printer			Possible cause of the fault	Fault remedy
65535
Control unit defective /SP
			t  Open circuit to the operating and display unit for air conditioner/Climatronic -E87- (terminal “30”, “15”,“ 75” or terminal “31”) t  Intermittent electrical fault or contact resistance in the wiring to the operating and display unit for air conditioner/Climatronic -E87- t  The control buttons of the operating and display unit for air conditioner/Climatronic -E87- are constantly pressed (button remains in). t  Errors in the program sequence for the operating and display unit for air conditioner/Climatronic -E87-. t  The operating and display unit for air conditioner/Climatronic -E87- is defective.	–  Use the current flow diagram to locate and rectify the fault in the wiring –  Check for dirt on the buttons for the operating and display unit for air conditioner/Climatronic -E87-. Clean them, if necessary. –  Replace the operating and display unit for air conditioner/Climatronic -E87-