Oldsmobile 2003 Silhouette Owner's Manual page 28

The stowable seat has seat position labels, located on
the back of the seat, showing where the seat must go.
Follow the floor pin diagram. Use the front floor pins of
the floor cups and the rear floor cups in the third row.
The seat must be placed in the proper location for the
legs to attach correctly.
Make sure the seat is in its upright position before
beginning this procedure.
1. Place the front hooks of the seat onto the front floor
pins in the third row. To do this, the seat will need to
be angled so the front hooks clear the floor pins.
If the front legs are not attached correctly, the rear
legs will not attach to the rear set of floor pins.
2. Firmly push the rear hooks into the rear floor pins
by pushing down on the rear of the seat.
3. Try to raise the seat to make sure that it is
locked down.
4. Push and pull on the seatback to make sure that
it is locked into place.
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