Diagnostic Functions: Notes
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2011 Volvo V50, 2010 Volvo V50, 2009 Volvo V50, 2008 Volvo V50, and 2007 Volvo V50. However, it is still accessible from the selected car via links, so may be relevant.
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output signals.