Hummer 2006 H3 Owner's Manual page 15

4. Lift the latch on top of the seatback and pull the
seatback forward. Fold the seatback down until it
is nearly flat.
5. If the seatback will not fold nearly flat, try moving
the front seat forward and/or moving the front
seatback more upright.
6. Repeat the steps for the other half of the 60/40 split
bench seat.
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