Checking the seat belt tensioner: Check
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Insert a wire in the pipe on the seat belt tensioner as shown in the illustration.
Check the position of the piston in the seat belt tensioner.
Piston position A:
The seat belt tensioner has deployed. Replace both the seat belt (inertia) reels and the seat belt tensioners. See Front seat belt .
Piston position B:
The seat belt tensioner has not deployed.
No action is required
NOTE:
If any airbag has deployed, all seat belts and tensioners must be replaced.