Oldsmobile 1999 Silhouette - Manual (Page 58)

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4. Buckle, position and release the safety belt as
described in “Rear Seat Outside Passenger Positions”
earlier in this section. Make sure that the shoulder
belt crosses the shoulder.
To remove and store the comfort guides, squeeze the
belt edges together so that you can take them out from
the guides. Slide the guide onto the storage clip.
Center Passenger Position
(Bench Seat)
Lap Belt
If your vehicle has a third row rear bench seat, someone
can sit in the center position.