Buick Enclave 2008 Owner's Manual page 18

To fold the seatback:
1. Remove anything on or under the seat.
2. Disconnect the rear safety belt mini-latch, using
a key in the slot on the mini-buckle, let the belt
retract into the headliner. Stow the mini-latch in
the holder located in the headliner.
4. Push the seatback forward to lay flat.
3. Pull up on the release
lever located on the
back of the seat.
The headrest moves
forward automatically.
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