Buick 2002 Rendezvous - Manual (Page 65)

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For second row outside positions do the following:
1. Remove the guide from its storage clip located on
the sidewall next to the outer side of each outside
passenger position.
2. Place the guide over the belt and insert the two edges
of the belt into the slots of the guide.
3. Be sure that the belt is not twisted and it lies flat.
The guide must be on top of the belt.