Buick 2005 Rendezvous - Manual (Page 12)

Reclining Seatbacks
To adjust a seatback, pull up on the lever located on
the outboard side of the driver’s or front passenger’s
seats. Release the lever to lock the seatback where you
want it. Push and pull on the seat to make sure it’s
locked into position. Pull up on the lever, and the seat
will go to its original upright position.
But don’t have a seatback reclined if your vehicle is
moving.
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