V70 L5-2.4L VIN 55 B5254S (1998)
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Remove "B" post inner panel. Pull off (attached with clips).
WARNING: The battery must not be connected when checking piston position.
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Stick a wire into the bottom of the seat belt tensioner tube, as illustrated.
Check seat belt tensioner piston position.
Piston in position A:
The seat belt tensioner has deployed.
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Replace both seat belt tensioners.
Piston in position B:
The seat belt tensioner has not deployed.
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Install "B" post inner panel.