Audi Workshop Service and Repair Manuals > A4 Mk2 > Heating, ventilation, air conditioning system | Auxiliary heater | Self diagnosis, V.A.G Inspection Service | Checking convenience data bus system

Localisation of possible cause of trouble > < Function of data bus systems

Checking convenience data bus system

Note

If the connector of one of the control units linked to the convenience data bus system has been unplugged and the ignition is switched on, a fault entry may be made in the other control units linked to the data bus system. This also applies if the power supply is interrupted, for example by removing a fuse.

The control unit in dash panel insert -J285- forms the interface between the two data bus systems. It is also the dominant control unit in the convenience data bus system. The control units connected to the convenience data bus system in the relevant vehicle (equipment-specific) are entered in this control unit by way of the adaption function. → Electrical system; Rep. Gr. 01 and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

t	The current flow diagrams can be used to establish the number of control units linked to the convenience data bus system. → Current flow diagrams, Electrical fault finding and Fitting locations

Heating, ventilation, air conditioning system
Auxiliary heater / Self diagnosis, V.A.G Inspection Service
Checking convenience data bus system
Checking convenience data bus system

Localisation of possible cause of trouble > < Function of data bus systems

Audi Workshop Service and Repair Manuals

A4 Mk2

Heating, ventilation, air conditioning system Auxiliary heater / Self diagnosis, V.A.G Inspection Service Checking convenience data bus system Checking convenience data bus system

Heating, ventilation, air conditioning system Auxiliary heater / Self diagnosis, V.A.G Inspection Service Checking convenience data bus system Checking convenience data bus system

Heating, ventilation, air conditioning system
Auxiliary heater / Self diagnosis, V.A.G Inspection Service
Checking convenience data bus system
Checking convenience data bus system

Heating, ventilation, air conditioning system
Auxiliary heater / Self diagnosis, V.A.G Inspection Service
Checking convenience data bus system
Checking convenience data bus system