Yah, I read that in my owner's manual, but not sure it is correct.
1) The seat belt warning light only comes on a few seconds after the car is started, not when the ignition is turned to the on position.
2) Not sure why it makes a difference if the passenger seat is occupied since there are no wires in the passenger seat belt connector.
3) The seat belt warning light will glow whether the driver's seat belt is fastened or unfastened (at least that's what some of us are experiencing).
Andy