Communication Systems, Fault Finding
WARNING: This page is about a different car, the 2011 Volkswagen CC, 2010 Volkswagen CC, and 2009 Volkswagen CC. However, it is still accessible from the selected car via links, so may be relevant.
All communication systems have On Board Diagnostic (OBD) capabilities.
When performing fault-finding, use Vehicle Diagnostic Tester in "Guided Fault Finding" function.