Remove the mechanical cable
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.
Remove the seat cushion for the rear seat.
Fold up the floor carpet by the rear seat. Place a wooden block or similar between the carpet and the floor.
Remove the rubber cable grommet by pressing it backwards in the bodywork.