Audi Workshop Service and Repair Manuals

The additional heater control unit -J162 receives information from electrical and electronic components (transmitters) which is then processed in line with the specified values.

The output signals of the control unit then regulate the electrical components (control elements).

The control unit -J162 is equipped with a fault memory so that the fault cause can be traced quickly in the event of component failure or an open circuit.

If faults occur in the monitored sensors and components, these are stored in the fault memory together with an indication of type of fault.

Always commence fault finding by starting self-diagnosis and interrogating the stored faults. The following units are available for interrogation of the stored data:

• ◆ Vehicle diagnostic, testing and information system VAS 5051
• ◆ Fault reader V.A.G 1551
• ◆ Vehicle system tester V.A.G 1552

The fault information which is displayed indicates specific repair measures via a fault table.

Notes on fault remedy:

• ◆ If a fault situation exists for longer than a certain period, the fault is stored as a static fault. If the fault is no longer present after a specified period, it becomes a sporadic fault. This process is constantly repeated. Sporadic faults are also identified as such (the additional letters /SP appear on the display).
• ◆ If a sporadic fault ceases to occur for a specific period, it is automatically erased.

The possibilities offered by self-diagnosis can only be utilised with the vehicle diagnostic, testing and information system VAS 5051, the fault reader V.A.G 1551 or the vehicle system tester V.A.G 1552, mode -1- "Rapid data transfer".

Self-diagnosis is not restricted to storage, interrogation, erasing and final control diagnosis. It also has basic setting, control unit identification adaption and encoding functions.

Mode -2- (flash code output) is not provided for the additional heater. Operating modes -3- (self-test) and -4- (dealership identification) only apply to fault reader V.A.G 1551 and the vehicle system tester V.A.G 1552 and are described in the relevant operating instructions.