Diagnostic Concept: General
WARNING: This page is about a different car, the 2011 Saab 9-3 and 2010 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
The demands on the car's functionality have developed strongly during the last years. Development has primarily affected the car's electrical system. From Saab 900 1994 when the instrument bus with 4 control modules via Saab 9-5 and 9-3 with the Infotainment bus and the Power train bus and 13 control modules on to the Saab 9-3 Sport Saloon with at most 30 control modules.
In addition to the I-bus and the P-bus, an Optical bus was introduced on the Saab 9-3 Sport Saloon, which interconnects the car's infotainment system. Furthermore, an electrically controlled steering column lock was introduced.