Secondary lock
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Pin housing
Release the front housing section on the pin housing by pulling out the rear catches while at the same time pressing the housing section forwards.
Socket housing
Open the catches and pull out the secondary lock, use tool 9512853 or an electrician's screwdriver, as shown in the illustration.