Lexus LX 470 1998 Owner's Manual page 91

COMFORT ADJUSTMENT
Adjusting seat cushion angle and height
16X004c
Move the control switch in the desired direction.
Releasing the switch will stop the seat cushion in that position.
74
Adjusting lumbar support (Driver's seat only)
16X005b
Push the control switch on either side.
The amount of lumbar support will change as long as the switch is
pushed.