Lexus RX400h2006 Owner's Manual page 195

OCCUPANT RESTRAINT SYSTEMS
Adjusting lumbar support
Push the control switch on either side.
The amount of lumbar support will change while the switch is
pushed.
168
Flattening seatbacks
Before flattening seatbacks, slide the rear seats as far
back as possible.
1 Push the seat position control switch forward to move the
seat forward.
2 Push the lock release button on the head restraint to
remove it.
3 Push the seat position control switch upward to raise the
seat.