GMC 2001 Sierra - Manual (Page 16)

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Manual Lumbar Control (If Equipped)
If your vehicle has a
lumbar adjustment, you
can increase or decrease
lumbar support in an area
of the lower seatback. It is
located on the outboard side
of the seat cushion.
To increase or decrease support, turn the knob toward
the front or rear of the vehicle.
Power Seat(s) (If Equipped)
Horizontal Control: If your vehicle has a power seat,
you can adjust it with this control located on the
outboard edge of the seat.
Raise or lower the front of the seat by raising or
lowering the forward edge of the button. Raise or
lower the rear of the seat by raising or lowering the
rear edge of the button.