S80 L5-2.5L Turbo VIN 59 B5254T2 (2004)
Insert a wire in the pipe on the seat belt tensioner as illustrated.
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: Seat Belt Tensioner
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.
Check seat belt function