S80 T6 Executive L6-2.8L Turbo VIN 90 B6284T (2001)
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Remove the rear seat cushion by pulling the top edge upward on the left and right-hand sides.
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Insert an extension with a 14 mm socket under the side cushion (1)
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Tighten the seat belt mounting on the left rear and right rear seat belts to 48Nm (35 ft. lbs.).
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Reinstall the rear seat cushion.