Power Seats; Power Lumbar - GMC 2003 Sierra 1500 Pickup Owner's Manual

Power Seats
If your vehicle has a power seat, you can adjust it with
these controls located on the outboard sides of the seats.
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If your vehicle has power reclining seats, you can use
the vertical control to adjust the angle of the seatback.
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.
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.
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