Toyota 2009 Tundra Owner's Manual page 187

1-7. Safety information
Center rear seat
Left rear seat
n
160
Latch the hook onto the inner
anchor strap ring and tighten the
top tether strap.
Make sure the top tether strap is
securely latched.
Inner anchor strap ring
Lower the head restraints of right
and center seats.
Raise the head restraints of cen-
ter and left seats.