GMC 2010 Savana 1500 Cargo Owner's Manual page 72

2-48
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 integrated
headrest or head restraint
and you are using a
dual tether, route the tether
around the headrest or
head restraint.
3. Push and pull the child restraint in different
directions to be sure it is secure.
If the position you are
using has an integrated
headrest or head restraint
and you are using a
single tether, route the
tether over the headrest or
head restraint.