Programming Immobilizer
WARNING: This page does not describe the selected car, but rather 164 other vehicles, including the 2002 Volvo V70, 2002 Volvo V40, 2002 Volvo S80, 2002 Volvo S60, and 2002 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
If ECM was disconnected or replaced, or battery was disconnected immobilizer must be reset. Connect Tech 2 or equivalent scan tool to DLC. Turn ignition on. On scan tool select BODY, and then TWICE. Select IMMOBILIZING. Immobilizer will self program after about 10 seconds.