Audi Workshop Service and Repair Manuals > A4 Cabriolet Mk2 > Heating, ventilation, air conditioning system | Air conditioning | Self diagnosis, V.A.G Inspection Service | Electrical checks on air conditioner | Wiring and component check using test box V.A.G 1598A | List of electrical checks at the operating and display unit, Climatronic control unit J255

List of electrical checks at the operating and display unit, Climatronic control unitJ255

List of electrical checks at the operating and display unit, Climatronic control unit -J255-

Note

Various items of information are transmitted via the convenience data bus system (reading measured value block → Chapter). There are no electrical checks provided for this information.

Test step

Component checked

Page

t	Power supply and earth connection of operating and display unit, Climatronic control unit -J255-

→ Chapter

t	Fresh-air intake duct temperature sensor -G89-

t	Right vent temperature sender -G151-, front vent temperature sender -G152-, left footwell vent temperature sender -G261-, right footwell vent temperature sender -G262-, evaporator outflow temperature sender -G263-

→ Chapter

t	Wiring to fresh air blower control unit -J126- and fresh air blower -V2-

→ Chapter

Control motors of air conditioner and corresponding potentiometers -central flap control motor -V70- / central flap control motor potentiometer -G112-, air flow flap control motor -V71- / air flow flap control motor potentiometer -G113-, defroster flap control motor -V107- / defroster flap control motor potentiometer -G135-, air recirculation flap control motor -V113- / air recirculation flap control motor potentiometer -G143-, left temperature flap control motor -V158- / left temperature flap control motor potentiometer -G220-, right temperature flap control motor -V159- / right temperature flap control motor potentiometer -G221-

→ Chapter

t	Pressure signal from high-pressure sender -G65-

→ Chapter

t	Actuation of air conditioning system compressor regulating valve -N280-

→ Chapter

t	Signal from sunlight penetration photosensor -G107-

→ Chapter

t	Input for activation signal for actuation of operating and display unit, Climatronic control unit -J255- (e.g. from service installed auxiliary heater)

→ Chapter

Heating, ventilation, air conditioning system
Air conditioning / Self diagnosis, V.A.G Inspection Service
Electrical checks on air conditioner / ring_and_component_check_using_test_box_v.a.g_1598a/">Wiring and component check using test box V.A.G 1598A
List of electrical checks at the operating and display unit, Climatronic control unit J255

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