GMC 2007 Sierra - Manual (Page 18)

Head Restraints
Adjust the head restraint so that the top of the
restraint is at the same height as the occupant’s
head. This position reduces the chance of a
neck injury in a crash.
Pull the head restraint up to raise it. Push the
head restraint down to lower it.
The rear seats may have head restraints that can
be adjusted up and down.
Seatback Latches
The front seatbacks fold forward to allow access
to the rear of the cab.
To fold the seatback forward, lift the lever located
on the outboard side of the seat cushion.
{ 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.
To return the seatback to the upright position,
push the seatback rearward until it latches. After
returning the seatback to its upright position,
push and pull on the seatback to make sure it is
locked.
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