GMC 2003 Safari Owner's Manual page 18

Bench Seat
Each bench seat can carry up to three passengers.
They can also be removed to increase storage space.
Only the rear bench seat can be adiusted forward
or rearward using the lever at the front of the seat.
The optional bench seats come with moveable armrests,
individual reclining seatbacks, adjustable headrests
and a fold-down center armrest console.
The center bench seat has
Move the seat adjustment
lever located at the front
of the seat toward the
passenger's side to
unlock it. 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
into place.
a pivoting right armrest.
To adjust your seatback, pull up on the lever located on
the outboard side of the seat cushion.
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