GMC 2002 Sierra - Manual (Page 11)

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D Move the seat forward or rearward by moving the
whole horizontal control forward or rearward.
D Raise or lower the rear of the seat cushion by raising
or lowering the rear edge of the horizontal control.
D Moving the whole horizontal control up or down
raises or lowers the entire seat cushion.
If your vehicle has power reclining seats, you can use
the vertical control to adjust the angle of the seatback.
Move the reclining front seatback rearward or forward
by moving the control toward the rear or the front of the
vehicle. See “Reclining Seatbacks” in the Index for
further information.
Power Lumbar Control (If Equipped)
If your vehicle has this
feature, the four
- way
control is located on the
outboard side of the seat.
To increase or decrease support, press and hold the front
or rear of the control. Let go of the control when the
lower seatback reaches the desired level of support.
You can also reshape the side wing area of the lower
seatback for more lateral support. To increase or
decrease support, press and hold the top or bottom of the
control. Let go of the control when the lower seatback
reaches the desired level of support.