Chevrolet 2008 Avalanche Owner's Manual page 56

1-52
If the position you are
using does not have a
headrest or head restraint
and you are using a
dual tether, route the tether
over the seatback.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a
dual tether, route the tether
around the headrest or
head restraint.
1.4. Attach the top tether attachment to the top
tether anchor.
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
push and pull on the seatback to be sure it is
locked.
1.5. Lift the seatback up and push it rearward.
Then lower the seat cushion until the
seatback and the seat cushion lock into
position.
If the position you are
using has an adjustable
headrest or head restraint
and you are using a
single tether, raise the
headrest or head restraint
and route the tether
under the headrest or head
restraint and in between
the headrest or head
restraint posts.