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: Identifying Ignition Switch OFF Position
Courtesy of VOLVO CARS OF NORTH AMERICA.
CAUTION:
At the earliest, disconnect connectors to the control module 30 seconds after the ignition has been turned off and the electric cooling fan has stopped running.