Chevrolet 2003 Tahoe Owner's Manual page 11

Power Seats
If your vehicle has a power seat, you can adjust it with
these controls located on the outboard sides of the
seats.
Raise or lower the front of the seat cushion by
raising or lowering the forward edge of the
horizontal control.
Move the seat forward or rearward by moving the
whole horizontal control forward or rearward.
Raise or lower the rear of the seat cushion by
raising or lowering the rear edge of the horizontal
control.
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 on page 1-5.
Power Lumbar
If your vehicle has this
feature, the four-way
control is located on the
outboard side of the seat.
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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.
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