GMC 1996 Suburban Owner's Manual page 10

If your vehicle has a manual
bucket, split bench or full
bench seat, you can adjust it
with this lever at the front
of the seat.
Power Driver's Seat (Option)
Slide the lever at the front of the seat toward the
passenger's side to unlock
it.
Using your body, slide the
seat to where you want it. Then, release the lever and try
to move the seat with your body, to make sure the seat is
locked in place.
If your vehicle has a power seat on the driver's side, you
can adjust it with these controls at the outside edge of
the seat.
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