GMC 2006 Sierra - Manual (Page 59)

1.4. Remove the trim cover to expose the top
tether anchor.
1.5. 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.
1.6. Lift the seatback up and push it rearward.
Then lower the seat cushion until the
seatback and the seat cushion lock into
position.
2. Attach and tighten the lower attachments to the
lower anchors. If the child restraint does not have
lower attachments or the desired seating position
does not have lower anchors, secure the child
restraint with the top tether and the safety belts.
Refer to your child restraint manufacturer
instructions and the instructions in this manual.
2.1. Find the lower anchors for the desired
seating position.
2.2. Put the child restraint on the seat.
2.3. Attach and tighten the lower attachments on
the child restraint to the lower anchors.
3. Tighten the top tether.
4. Push and pull the child restraint in different
directions to be sure it is secure.
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