Chevrolet 2002 Tahoe Owner's Manual page 11

Power Seat(s) (If Equipped)
1-4
If your vehicle has a power seat, you can adjust it with
these controls located on the outboard sides of the seats.
D
Raise or lower the front of the seat cushion by
raising or lowering the forward edge of the
horizontal control.
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.