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.
Fig 1: Removing/Installing Steering Wheel Module
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove the steering wheel module (2x Torx 30).
Carefully disconnect the white (W) connector.
Move the steering wheel module to one side. Always place the igniter side face down.