Diagnostic functions: Programming
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
To increase the security of the immobilizer system, the central electronic module (CEM) and the engine control module (ECM) are linked to each other with codes. The codes must be programmed if a control module is replaced before the vehicle can be started. Programming replaced control modules takes place automatically when downloading software into the new control module.