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Checking belt buckle release
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Release the seat belt by pressing with a finger on the button on the belt buckle.
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Carry out the test procedure at least 5 times. If the buckle fails to jump out even just once, the entire seat belt and belt buckle must be replaced.
NOTE:
Lubricants must never be used to remedy noises or sluggishness of the buttons on the belt buckles.
Checking sash guides
Plastic-coated covers show fine, parallel scores after the belt system has been subjected to stress (seat belt buckled during accident). On the other hand,
wear caused by frequent use is indicated by a stripe-free, smooth surface.
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Inspect the sash guides for distortion, flaking and crack formation.
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In the case of scoring and/or damage, the entire seat belt and belt buckle must be replaced.
Checking mounting elements and mounting points
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Check the belt buckle strap for distortion.
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Check the function of the height adjuster.
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Check the mounting points (seat, B-pillar, C-pillar, vehicle floor) for distortion or thread damage.
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If damage is found on the parts, the entire seat belt and belt buckle must be replaced.
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Replace damaged or distorted mounting points.
This is a source reference. Confirm exact model applicability in the original material.