Oldsmobile 1999 Alero - Manual (Page 9)

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Power Lift Seat-Forward/Rearward
Controls (If Equipped)
Move the control lever under the front of the seat to
unlock it. Slide the seat to where you want it. Then
release the lever and try to move the seat with your
body, to make sure the seat is locked into place.
Power Lift Seat-Height Controls
(If Equipped)
The power seat switch is located on the lower, left side
of the driver’s seat. Raise the seat by holding the switch
up. Lower the seat by holding the switch down.