Chevrolet 2009 Avalanche Owner's Manual page 20

3. Fold the seatback forward until it is flat. You
may have to move the front seats forward slightly
to do this.
4. Repeat the procedure for the other side.
To return the seats to the normal position, push the
seatback up and fold the seat cushion down.
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CAUTION:
{
A safety belt that is improperly routed, not properly
attached, or twisted will not provide the protection
needed in a crash. The person wearing the belt
could be seriously injured. After raising the rear
seatback, always check to be sure that the safety
belts are properly routed and attached, and are
not twisted.
CAUTION:
{
If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always be
sure to press the rear of the seat cushion down.
This action locks the seatback in place.
Push and pull on the seatback to make sure it is locked.
Raise the head restraint.