S40 2.4i L5-2.4L VIN 38 B5244S4 (2008)
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Find the grip strip (consists of two different strip profiles that are hooked into each other) in the bottom edge on the upholstery.
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Get a weatherstrip tool and pry apart the strips so that the catch (1) releases.
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Pull out the rear part of the upholstery with strip (2).
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Insert a curtain wire or similar from above and down on the back of the seat back, between the upholstery and padding.