Opel Blazer Operation & Maintenance Instructions Manual page 45

4. Push the latch plate into the buckle until it clicks. If
the rear seat belt stops before it reaches the buckle,
tilt the latch plate and keep pulling until you can
buckle it. Make sure the release button on the buckle
faces upward or outward.
5. Pull on the shoulder part to adjust the lap fit. To
unlatch the belt, press the button on the buckle.
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