WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Terminal Removal Tool Inserted In Cavity On Connector Side Of Housing
Courtesy of VOLVO CARS OF NORTH AMERICA.
A terminal removal tool is usually required to release the locking tab/locking catch so that the cable terminal can be extracted and removed.