GMC 1996 Sierra Owner's Manual page 15

After returning the seat to its regular position, try to
move the seat with your body in order to make sure the
seat is locked into place.
'
A\
CAUTION:
I
If any easy entry seat isn't locked, it can move. In
a sudden stop or crash, the person sitting there
could be injured. And, even if there is no crash
or
sudden stop, a driver sitting in an unlocked easy
entry seat could be startled by the sudden
movement and hit the wrong control or pedal,
causing a n accident. After you've used it, be sure
to push rearward on any easy entry seat to be
sure it is locked.
Rear Seat (Extended Cab)
Folding the Rear Seat
The extended
cab
may have a rear folding seat
which can be folded open for more seating space.
To
use the seat:
1.
Pull
the entire seat forward until it is flat.
2. Then pull forward on the
RELEASE lever under
the seat cushion,
on
the
passenger's side of the
rear seat. Push the
seatback rearward until
it latches.
3. After pushing the seatback upright into position, pull
the seatback forward to make sure it is locked.
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