Contact breakers at doors and hatches.
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.
There are contact breakers in the side door and tailgate/trunk lid lock units which indicate whether the door or tailgate/trunk lid is open or closed, and a contact breaker located at the hood if the vehicle is equipped with alarm. There are no contact breakers by the fuel tank filler cover. The contact breakers are closed if the door or hatch is closed and then provide a direct ground connection to the rear electronic module (REM).