The diagnostic demonstrator was developed after the end of the RESEDA project. The demonstrator was made to evaluate the results of our research on model-based diagnostics.
The RESEDA projet (Réalisation d'un Environnement Système Evolutif pour le Diagnostic Automobile) aimed to realize a system evolutionary environment for automotive diagnostics. The Java language was selected to develop the environment (see the RNTL page for more information).

The diagnostic pogram (diaglet) developed in Java using the diagnostic framework (see the projects' main page for more information about the framework) was adapted for J2ME environments. Then, it was installed on a hardware card with a Java microprocessor (the Java diagnostic card).
The card can be embedded in any environment with a CAN communication bus as all the communications between the diag card and the external environment are, exclusively, done via the CAN bus.

The diagnostic programs monitor the target system and display any faulty behaviour on the car's dashboard. The driver can know, instantly in real-time, the car's system state and act consequently. Moreover, as the diagnostic messages are made available through the CAN bus, the car's system can also process special procedures according to the type of messages. For example, if a critical fault is reported, the car's electronical control unit (ECU) can decide to stop the vehicle until the situation is corrected.

The diagnostic programs also record the behaviour of the car so the drive can be replayed and analyzed to quickly find the root cause of any faults. The recorded logs are made available through a secure radio connection such as bluetooth or GSM. For example, if a fault is detected, the mechanic will only have to connect, with his computer, to the Java diagnostic card with a bluetooth connection, to retrieve the recorded logs.