Buick 2004 Rendezvous Owner's Manual page 27

The stowable seat has seat position labels, located on
the back of the seat, showing where the seat must go.
The seat must be placed in the proper location for the
legs to attach correctly.
Make sure that the seatback is folded forward before
beginning this procedure.
1. Remove the nuts from the screws.
2. Place the stowable seat on the vehicle floor so that
the brackets are placed over the screws.
3. Reinstall the nuts back onto the screws. Torque to
approximately 18 lb ft (25 Y).
4. Try to raise the seat to make sure that it is
locked down.
5. Raise the seatback to its upright position.
Push and pull on the seatback to make sure that it
is locked into place.
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